If you smoke, please go outside.

A. can B. should C. must D. may

 

C

【解析】句意為“如果你非得要抽煙，請到外面去抽�！眒ust (表示主張)一定要，堅(jiān)持要。根據(jù)后一句please go outside的要求，選C。

 

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