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Don’t take too much of the medicine;it does you more harm than good if you______


  1. A.
    do
  2. B.
    take
  3. C.
    like
  4. D.
    have
A
解析:
if you do是省略形式,为了避免重复,常用助动词代替谓语动词。do代替上文中的take too much of the medicine。have用于代替上文中的现在完成时。
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