【題目】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】考查動詞短語辨析。句意：一旦決定做某事，他是不可能改變主意的。depend on“依靠，取決于”；debate on “就某事辯論”；rely on“依靠”；decide on“決定，選定”。根據(jù)語境，故選D。

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