题目内容
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：我发现很有必要节约能源和保护环境。Find it + 形容词 +to do sth发现做某事…，其中的it是形式宾语，真正的宾语是后面的动词不定式。所以选C。
考点：考查代词。
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