成人英语三级

单选题 He was writing __________ the glass suddenly fell on the floor．

A．while
B．before
C．so
D．when

参考答案：D进入在线模考
【参考译文】 当那个玻璃杯突然捧到地上时，他正在写作。
【答案解析】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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