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【题目】We must find out ____ Karl is coming, so we can book a room for him
A.when
B.how
C.where
D.why

【答案】A
【解析】句意:我们必须弄明白什么时候来,因此我们能给他预定房间。Find out后面跟着宾语从句。根据句意这是when引导的宾语从句。

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