题目内容

Mary _____ be in London because I saw her in town just now.  
A．mustn’t　　B．isn’tabletoC．maynot　D．cannot
D
略
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17．---May I surf the Internet tonight?
--- No, you ______．You must do the exercises．
A．needn’tB．won’tC．mustn’tD．don’t

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