【題目】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：當他進來時，我剛好正在實驗室做實驗。happen后跟動詞不定式，根據(jù)句意可知動詞不定式的動作正在進行，且與謂語動詞happen同時發(fā)生，故用動詞不定式的進行式。

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