He was writing________the glass suddenly fell on the floor.A、whileB、asC、soD、w

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问题 He was writing________the glass suddenly fell on the floor.

选项 A、while
B、as
C、so
D、when

答案 D

解析句意：他正在写作的时候，玻璃突然掉到了地上。when常可加副词suddenly以强调其后并列分句动作的突然性，带有一种使人意想不到的含义，故选D。

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Hewaswriting________theglasssuddenlyfellonthefloor.A、whileB、asC、soD、w