He was writing______the glass suddenly fell on the floor.A、whileB、beforeC、soD

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问题 He was writing______the glass suddenly fell on the floor.

选项 A、while
B、before
C、so
D、when

答案 D

解析本题考查连词的用法。划线处需要表示“当……的时候”的连词，所以B和C排除。因为后面的动作是短暂动作，while表示后面的动作正在进行，也是错误的。故本题选D。

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