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【题目】When he came in, I happened __________ my experiment in the lab.

A. to do B. to be doing

C. to have done D. to be done

【答案】B

【解析】句意:当他进来时,我刚好正在实验室做实验。happen后跟动词不定式,根据句意可知动词不定式的动作正在进行,且与谓语动词happen同时发生,故用动词不定式的进行式。

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