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【題目】【2016湖北黃石】— 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，你在做什么？－我在睡覺。A．unless如果不，除非；引出條件狀語從句；B．once一旦……，引出時間狀語從句；C．when當……時；D．while當……時，后跟延續(xù)性動詞。本題表示“當……時”，knock是非延續(xù)性動詞，故選B。

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