【題目】The experts were doing their experiment in the lab, ______ what happened outside.

A. didn’t know B. not knew

C. not knowing D. having not known

【答案】C

【解析】

試題分析：句意：專家們當(dāng)時正在實驗室做實驗，不知道外面發(fā)生的事情。A. didn’t know 一般過去時；B. not knew一般過去時；C. not knowing現(xiàn)在分詞，表示主動正在； D. having not known現(xiàn)在分詞的完成時，表示主動先發(fā)生，否定詞應(yīng)該位于句首。前后句沒有連詞，考查非謂語結(jié)構(gòu)，“專家”和“知道”是主動關(guān)系，故選C。

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