(单选题)

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

A.proving it is difficult

B.how to prove is not easy

C.when to prove it is difficult

D.to prove it is quite another matter

参考答案：D

参考解析：

考查非谓语动词。句意：指控某人犯有某种罪行是一回事，而证明这一点则完全是另一回事。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。故选D。

知识点：

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