问题
选择题
Don’t take too much of the medicine;it does you more harm than good if you______.
A.do
B.take
C.like
D.have
答案
答案:A
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。