问题
选择题
— Must we sweep the floor right now?
— No, you ________.You can do it later [ ]
A. mustn't
B. don't
C. don't have to
答案
答案：C
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— Must we sweep the floor right now?
— No, you ________.You can do it later [ ]
A. mustn't
B. don't
C. don't have to
答案：C