题目内容
______ hearing the news of the success, he opened his mouth wide, and then had a big smile on his face.
A. To B. Upon C. In D. With
B
【解析】考察upon doing结构。一听到成功的消息,他张大了自己的嘴巴,脸上浮现出大大的笑容。Upon和on一般可以通用,这里的upon doing和on doing一个意思,表示一…就…相当于 as soon as或when引导的时间状语从句。故选D
考点:考察介词用法
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