题目内容
—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
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题目内容
—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