The air in the room ________ fresh, I think.


  1. A.
    isn’t
  2. B.
    didn’t
  3. C.
    hasn’t
  4. D.
    weren’t
A
fresh是個(gè)形容詞，意為“新鮮的”，前面應(yīng)用連系動(dòng)詞，air做主語(yǔ)時(shí)，動(dòng)詞用單數(shù)。
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