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【题目】I didn’t know ________ the professor would give us a lecture in the hall.

A. where B. when C. what D. why

【答案】B

【解析】试题分析:句意:我不知道那个教授将什么时间在大厅里给我们上课。根据句子的结构可知缺少时间状语,故选B

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