[题目]He was sleeping someone knocked on the door.A.whenB.whileC.asD.after 题目和参考答案——青夏教育精英家教网—

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【题目】He was sleeping someone knocked on the door.
A.when
B.while
C.as
D.after

【答案】A
【解析】句意：他正在睡觉突然有人来敲门了。过去进行时与when连用，表示“在某一动作正在进行的过程当中，突然发生了另外一个动作”，此题考查连词，其它连词都无此用法，故此题选A。

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