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______ experiments in the lab, it started to rain heavily.A、While he was perform
______ experiments in the lab, it started to rain heavily.A、While he was perform
游客
2023-10-11
24
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问题
______ experiments in the lab, it started to rain heavily.
选项
A、While he was performing
B、While performing
C、To perform
D、Performing
答案
A
解析
句意:他在实验室进行实验时,天下起了倾盆大雨。考查从句和非谓语动词用法。【B】【D】选项要求主句主语it和performing之间是主动关系,而事实上是被动关系。【C】动词不定式表将来,而该句的时间背景为过去。
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