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I found _____ necessary to save energy and protect the environment.

A.that B.this C.it D.one 

C

解析试题分析:句意:我发现节约能源保护环境是必要的。find it +形容词+to do sth。it代替动词不定式做形式宾语,故选C。
考点:考查代词的用法。

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