I didn’t know ________ the professor would give us a lecture in the hall.
A．whereB．whenC．whatD．why
B

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