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引導(dǎo)條件狀語從句，主語用一般將來時，從句用一般現(xiàn)在時；并且從句中主語是he，那么謂語動詞用第三人稱單數(shù)形式，故選B。
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