SAT Practice 20 · Mistakes Review
Question 2 ✗ Incorrect
Which choice completes the text so that it conforms to the conventions of Standard English?
The city closed the old bridge for two ______ engineers needed time to repair the cables that hold up the road.
- weeks; because
- weeks, and because Your choice
- weeks. Because
- weeks because Correct answer
Your answer: B · Correct answer: D
Explanation · 解析
左：The city → closed（IC）；右：because engineers needed …（DC）。
weeks because：IC because DC，紧密说明原因，不加标点。
weeks; because：分号后不是 IC。
weeks. Because：because 从句单独成句，fragment。
weeks, and because：and 和 because 重复连接。
because 开头的是 DC，要连到主句上。
Question 9 ✗ Incorrect
Which choice completes the text so that it conforms to the conventions of Standard English?
Many students feel more alert in ______ have eaten a good breakfast.
- class; when they
- class. When they Your choice
- class when, they
- class when they Correct answer
Your answer: B · Correct answer: D
Explanation · 解析
左：Many students → feel（IC）；右：when they have eaten …（DC，说明条件）。
class when they：IC + 紧接的 when 从句，不加标点。
class; when they：分号后不是 IC。
class. When they：When 从句单独成句，fragment。
class when, they：逗号把 when 和它的主语 they 拆开。
when / because 从句紧跟在主句后时直接连接。
Question 10 ✗ Incorrect
Which choice completes the text so that it conforms to the conventions of Standard English?
Honeybees tell one another where to find flowers by performing a movement called the waggle dance. The angle of the dance shows the direction of the ______ length of time each waggle run lasts shows how far away they are.
- flowers, the
- flowers; the Correct answer
- flowers the
- flowers, which the Your choice
Your answer: D · Correct answer: B
Explanation · 解析
左：The angle → shows；右：the length of time … → shows（each waggle run lasts 修饰 time）。两边都是 IC。
flowers; the：分号连接两个 IC。
flowers, the：只用逗号，comma splice。
flowers the：什么都不用，run-on。
flowers, which the：which 后面还有完整的 the length … shows，句子不通。
先找空格右边的新主语 the length。
Question 12 ✗ Incorrect
Which choice completes the text so that it conforms to the conventions of Standard English?
Because tree frogs have sticky pads on their ______ can climb smooth surfaces such as glass.
- toes; they
- toes. They
- toes, so they Your choice
- toes, they Correct answer
Your answer: C · Correct answer: D
Explanation · 解析
左：Because tree frogs have …（DC）；右：they can climb …（IC）。
toes, they：DC, IC。
toes; they：分号不能连 DC 和 IC。
toes. They：Because 从句单独成句，fragment。
toes, so they：because 和 so 不同时用。
前置 Because 从句后用逗号接主句。
Question 13 ✗ Incorrect
Which choice completes the text so that it conforms to the conventions of Standard English?
A study showed that a solar park caused nearby land to cool, though the ecological impact of this temperature decrease isn’t yet known. Before the park’s construction, the surface temperature 30 meters outside of the park boundary was 0.1°C cooler than that of a control ______ construction, the temperature 30 meters outside of the boundary was 1.7°C cooler than that of the control area.
- area after
- area after,
- area. After Correct answer
- area, after Your choice
Your answer: D · Correct answer: C
Explanation · 解析
左：the surface temperature → was（IC）；右：After construction 是介词短语，后面 the temperature → was（IC）。两边都是 IC，没有连接词。
A：两个 IC 直接相接，run-on。
B：仍是 run-on，逗号还把 after 和 construction 拆开。
C：句号分开两个 IC；After construction 开始第二句（和 Before the park’s construction 对应）。
D：只用逗号，comma splice。
介词短语开头不等于 DC：越过 After construction 找主语 the temperature。
Question 19 ✗ Incorrect
Which choice completes the text so that it conforms to the conventions of Standard English?
Painter Frida Kahlo often used the bright colors of Mexican folk ______ included symbols from ancient Mexican cultures in her self-portraits.
- art, she
- art, and Your choice
- art and Correct answer
- art;
Your answer: B · Correct answer: C
Explanation · 解析
主语 Frida Kahlo → used … and included。
art and：一个主语两个动词，不加逗号。
art, and：SAT 规则：and 后没有新主语，不加逗号。
art;：分号后 included … 没有主语。
art, she：she included … 是 IC，只用逗号连接两个 IC，comma splice。
先找 included 的主语：还是 Frida Kahlo。