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【题目】We found _____ necessary to protect the environment.
A.it
B.this
C.that
D.what

【答案】A
【解析】句意为:我们觉得保护环境很有必要。根据语境可知,这里动词后应接宾语。由于句子的正真宾语为后面的动词不定式,为了避免句子的头重脚轻,常用代词it作形式宾语。结合选项可知应选A。

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