【題目】— What were you doing ______ I knocked at the door?

— I was sleeping.

A. unless B. once

C. when D. while

【答案】B

【解析】試題分析:句意:-我敲門時(shí),你在做什么?-我在睡覺。Aunless如果不,除非;引出條件狀語從句;Bonce一旦……,引出時(shí)間狀語從句;Cwhen當(dāng)……時(shí);Dwhile當(dāng)……時(shí),后跟延續(xù)性動詞。本題表示當(dāng)……時(shí)knock是非延續(xù)性動詞,故選B。

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