______ hearing the bad news, the mother began to cry.A、OnB、AtC、WithD、ForAon/

游客2023-10-04  21

问题 ______ hearing the bad news, the mother began to cry.

选项 A、On
B、At
C、With
D、For

答案 A

解析 on/upon doing结构为英语一固定结构,表示“一……就……”。
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