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

A. what B. if C. when

【答案】B

【解析】

句意:我不知道他們是否通過(guò)了考試。考查賓語(yǔ)從句。what問(wèn)事情;when問(wèn)時(shí)間;if是否,表疑問(wèn)。根據(jù)I don't know,結(jié)合句意語(yǔ)境,可知本句表疑問(wèn),AC不合句意,故選B。

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