--Could you please _____ in the room?
--Oh, I’m sorry.
A．not smokingB．not smokeC．not to smokeD．don’t smoke
B
本題中情態(tài)動(dòng)詞could后應(yīng)跟動(dòng)詞原形，否定形式只需在could后加not，或在主要謂語(yǔ)動(dòng)詞前加not，故本題選B。
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