If you ________ smoke in the room, please keep the windows open.

A．shouldB．mayC．shallD．must

D

解析試題分析：考查情態(tài)動詞：A. should應(yīng)該B. may 可以C. shall將，會，可以，D. must必須，偏要，句意：如果你偏要抽煙，請把窗戶打開。選D。
考點：考查情態(tài)動詞用法
點評：情態(tài)動詞表推測注意以下解題步驟：認真審題，結(jié)合所給出的語境，正確把握說話者的語氣、情感、態(tài)度、觀點等。認真思考所給選項中情態(tài)動詞的基本特征和用法，并結(jié)合語境推敲答案。

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