______seeing the damage he had done, he felt ashamed.

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

选项 A、By
B、On
C、At
D、For

答案B

解析 介词。 “on+动名词”往往用于句中表示时间状语,意为“在……时候”,是一常用的固定搭配。
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