Teenagers who drop out of school do______for different reasons.

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问题 Teenagers who drop out of school do______for different reasons.

选项 A、them
B、/
C、it
D、theirs

答案C

解析 代词用法题。句子主干是Teenagers do——for different reasons。who引导的定语从旬修饰先行词Teenagers. A指代不明;因为do是及物动词,后面需要接宾语,所以排除B;D“他们的(东西)”不符合句意。C选项it代指drop out of school这件事,因此选择C。
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