问题
选择题
—I still have a toothache.
—Oh, sorry, the medicine didn't work, so you ________try another kind. [ ]
A. need
B. mustn't
C. may
D. can't
答案
答案：C
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—I still have a toothache.
—Oh, sorry, the medicine didn't work, so you ________try another kind. [ ]
A. need
B. mustn't
C. may
D. can't
答案：C