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【题目】I don't know________ they have passed the exam.

A. what B. if C. when

【答案】B

【解析】

句意:我不知道他们是否通过了考试。考查宾语从句。what问事情;when问时间;if是否,表疑问。根据I don't know,结合句意语境,可知本句表疑问,AC不合句意,故选B。

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