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If he ________ harder, he will catch up with us soon.


  1. A.
    study
  2. B.
    studies
  3. C.
    will study
  4. D.
    studied
B
解析:
if引导条件状语从句,主语用一般将来时,从句用一般现在时;并且从句中主语是he,那么谓语动词用第三人称单数形式,故选B。
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