题目内容
【题目】The experts were doing their experiment in the lab, ______ what happened outside.
A. didn’t know B. not knew
C. not knowing D. having not known
【答案】C
【解析】
试题分析:句意:专家们当时正在实验室做实验,不知道外面发生的事情。A. didn’t know 一般过去时;B. not knew一般过去时;C. not knowing现在分词,表示主动正在; D. having not known现在分词的完成时,表示主动先发生,否定词应该位于句首。前后句没有连词,考查非谓语结构,“专家”和“知道”是主动关系,故选C。
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