We found ________ necessary to protect the environment.

A.
it
B.
this
C.
that
D.
what

A
解析：
分析與
解答：此題考查動詞不定式的用法。在很多情況下，尤其在口語里，常用it代替動詞不定式作形式賓語或形式主語，而把不定式移到句子后面去，使句子不至于頭重腳輕。因此，該題的正確答案是A．例如：It isn’t easy to give the baby an injection. 給嬰兒打針不容易。I find it interesting to work in a hospital. 我發現在醫院里工作很有意思。

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We found ________ necessary to protect the environment.