It is one thing to accuse a person of a certain crime, but ______.

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问题 It is one thing to accuse a person of a certain crime, but ______.

选项 A、proving it is different
B、how to give proof is no easy
C、when to prove it is difficult
D、to prove it is quite another matter

答案D

解析因为句中it是形式主语，真正的主语是不定式to accuse。由but引导的分句中需用不定式to prove做主语，与to accuse是平行结构。A、B和C项不能与前面to accuse构成平行结构，所以排除。

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大学英语四级

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