问题
选择题
You _____ buy a gift, but you can if you want to. [ ]
A. must
B. mustn't
C. have to
D. don't have to
答案
答案：D
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You _____ buy a gift, but you can if you want to. [ ]
A. must
B. mustn't
C. have to
D. don't have to
答案：D