【題目】If you_______ smoke, please go outside.

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

【答案】C

【解析】

試題分析：考查情態(tài)動詞和虛擬語氣。A. 可以；B. 應(yīng)該；C. 必須；D. 或許。句意：如果你必須要吸煙，請到外面去。故選C。

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