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----______ we clean the blackboard at once ? ----No, you _____ . You_____ clean it after class. A. M...
题目内容：
----______ we clean the blackboard at once ?
----No, you _____ . You_____ clean it after class.
A. Must; needn’t; may B. Must; mustn’t ; can
C. Shall ; can’t must D. Need; mustn’t ; may
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