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【题目】—Where is he exactly?

—I dont know, but I saw him _______ an experiment in the lab when I passed by.

A. to conduct B. conducted

C. conducting D. conduct

【答案】C

【解析】

试题分析:考查动词非谓语形式。句意:——他到底在哪里? ——我不知道,但是当我路过的时候,我看见他正在实验室做实验。根据语境,本句为see somebody doing something,故选C。

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