If you_______ smoke, please go outside.

A．canB．should
C．mustD．may

C

解析試題分析： 考查情態(tài)動(dòng)詞。句意：如果你非得抽煙，請(qǐng)出去抽吧。Must表示主張,硬要，一定要If you must go, at least wait till the rain stops. 如果你堅(jiān)持要走，至少也要等雨停了再走,故選C項(xiàng)。
考點(diǎn) : 考查情態(tài)動(dòng)詞

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