______ experiments in the lab, it started to rain heavily.A、While he was perform

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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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