【題目】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】試題分析：句意：我不知道那個(gè)教授將什么時(shí)間在大廳里給我們上課。根據(jù)句子的結(jié)構(gòu)可知缺少時(shí)間狀語(yǔ)，故選B。

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