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【题目】It is impossible for him to change his mind once he has ________ doing something.

A. depended on B. debated on

C. relied on D. decided on

【答案】D

【解析】考查动词短语辨析。句意:一旦决定做某事,他是不可能改变主意的。depend on“依靠,取决于”;debate on “就某事辩论”;rely on“依靠”;decide on“决定,选定”。根据语境,故选D。

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