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问题: She was riding to school _____ she was hit by a motorbike yesterday moring.

A.while B.when C.as D.so

解答:

She was riding to school _____ she was hit by a motorbike yesterday moring.A.while B.when C.as D.so

答案选B。
意思是:昨天她正骑车去学校的时候突然被一辆摩托车撞了。

when 表示突然。

Awhile要接两个对等的动作。

C表示原因或当。。。时候,

D。表示因果,因此。

只有B表示突然,前面一件事被后面的事情打断。