【題目】— What were you doing I knocked at the door?
— I was sleeping.
A.unless
B.once
C.when
D.while

【答案】C
【解析】考查連詞辨析。句意:-我敲開門時,你在做什么?-我在睡覺。A. unless 如果不,除非;B. once一旦……,引出時間狀語從句;C. when當(dāng)……時;D. while當(dāng)……時,后跟延續(xù)性動詞。本題表示“當(dāng)……時”,knock是非延續(xù)性動詞,故選B。

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