We found___necessary to protect the environment.A.it B.this C.that D.what这题应该怎么选?

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We found___necessary to protect the environment.A.it B.this C.that D.what这题应该怎么选?
We found___necessary to protect the environment.A.it B.this C.that D.what
这题应该怎么选?

We found___necessary to protect the environment.A.it B.this C.that D.what这题应该怎么选?
这题填上it,这里it是形式宾语,后面to的不定式才是真正的宾语

A
固定句型：it is necessary to ，其中is可以省略

A it
we found 是主句
it necessary to protect the environment 是宾语从句
it是形式主语，真正的主语是to protect the envionment
翻译：我们发现有必要保护环境

AA
固定句型，它是FOUND的从句，省略IS

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