【題目】__________ the task, they had to stay in the lab for another two hours.

A. Not completing B. Not completed

C. Not having completed D. Having not completed

【答案】C

【解析】C 句意：由于還沒有完成任務(wù)，他們不得不在實驗室再待兩個小時。動詞-ing形式的完成式表示動作發(fā)生在had to stay in the tab for another two hours 之前，其否定形式是在動詞-ing之前加not。

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