______seeing the damage he had done, the child felt ashamed.A、ByB、OnC、AtD、For

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问题 ______seeing the damage he had done, the child felt ashamed.

选项 A、By
B、On
C、At
D、For

答案 B

解析 “on+doing sth．”意为“就在某时或某场合(之后)”，“……就……”。

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