【題目】—Where is he exactly?

—I don’t 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】

試題分析：考查動詞非謂語形式。句意：——他到底在哪里？ ——我不知道，但是當(dāng)我路過的時候，我看見他正在實(shí)驗(yàn)室做實(shí)驗(yàn)。根據(jù)語境，本句為see somebody doing something，故選C。

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