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【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(shí)驗(yàn)室再待兩個(gè)小時(shí)。動(dòng)詞-ing形式的完成式表示動(dòng)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(dòng)詞-ing之前加not。

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