_______ trees have been planted these years.


  1. A.
    Million
  2. B.
    Millions
  3. C.
    Million of
  4. D.
    Millions of
D
這題考查數(shù)詞的用法，因為這句話沒有具體數(shù)字，所以不能選A，Millions of是“上百萬的”，修飾trees，句意是：這些年種了上百萬的樹。選D。
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