We found ________ necessary to protect the environment.


  1. A.
    it
  2. B.
    this
  3. C.
    that
  4. D.
    what
A
解析：
分析與
解答：此題考查動(dòng)詞不定式的用法。在很多情況下，尤其在口語(yǔ)里，常用it代替動(dòng)詞不定式作形式賓語(yǔ)或形式主語(yǔ)，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(fā)現(xiàn)在醫(yī)院里工作很有意思。
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