20．--May I smoke here?--No.you only do that in the smoking room．A．can B．need C．mustn't D．couldn't 【查看更多】

 

題目列表(包括答案和解析)

--May I smoke here?

--No，you         only do that in the smoking room．

A．can                     B．need                    C．mustn't                  D．couldn't

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