Once ______ of the necessity of a move, he worked hard to find a new home.A、conv

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问题 Once ______ of the necessity of a move, he worked hard to find a new home.

选项 A、convinced
B、be convinced
C、convincing
D、having convinced

答案 A

解析 be convinced of 相信，确信；once引导分词短语作状语，省略了be动词。

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