It is known to us that it takes years of ________ practice to gain ________ skills of ________ expert.


  1. A.
    不填; the; an
  2. B.
    不填; the; the
  3. C.
    the; the; an
  4. D.
    a; 不填; the
A
practice為不可數(shù)名詞，此處泛指“實踐”，所以不用冠詞．expert可數(shù)名詞，此處表示“一個專家”．因有定語修釋，所以skills前使用定冠詞．
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