题目内容

-- Must I water the flowers right now?
--No, you           . You may do it after supper.
A. mustn't                  B. needn't                    C. can't
B
：must的含义是必须一定，其否定形式mustn’t表示禁止的含义。故must的否定回答一般借助于needn’和don’t have to来构成，句意:我必须立即浇花吗？——不，你不必。你可以晚饭后再浇。结合语境可知选B。
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