When you read books, you had better make marks ______ you have questions.

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问题 When you read books, you had better make marks ______ you have questions.

选项 A、where
B、in where
C、at which
D、which

答案A

解析 where 这前不可有介词,故B项错误。C项“at which”及D项“which”均不可引导状语从句。在句子的后半部分“you had...questions”中,“______you have questions”作从句。根据句意,它应当充当表示地点状语从句,修饰主句的谓语动词make,故应用where引导。
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