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  3. ______ experiments on the laboratory, it started to rain heavily.

______ experiments on the laboratory, it started to rain heavily.

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问题 ______ experiments on the laboratory, it started to rain heavily.
选项 A、While performing
B、Performing
C、While I was performing
D、To perform
答案C
解析 本题考查连词while引导的时间状语从句。
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