Don’t take too much of the medicine;it does you more harm than good if you______.
A．doB．take
C．likeD．have
A
if you do是省略形式，為了避免重復(fù)，常用助動(dòng)詞代替謂語動(dòng)詞。do代替上文中的take too much of the medicine。have用于代替上文中的現(xiàn)在完成時(shí)。
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