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7.--- May I go swimming now?

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7.--- May I go swimming now?
--- No,you ______.You must finish your homework first.
A.mustn’t B.may not C.couldn’t D.needn’t [1298]
8.--- Excuse me.Where is the zoo?
--- Sorry,I don’t know.Ask that policeman.He _____ know.
A.shall B.may C.need D.would [1299]
但是mustn't不是禁的意思吗?
7.--- May I go swimming now?
7.A mustn"t or can"t
8 B may 表示推测 可能的意思