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【题目】I don’t know ____________ they have passed the exam.

A. when B. where C. if

【答案】C

【解析】

句意:我不知道他们是否已经通过了那次考试。这里是宾语从句,这里是if引导的宾语从句,是否已经通过考试了。A. when何时;B. where在哪;C. if如果。根据题意,故选C。

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