题目内容

--Could you please _____ in the room?
--Oh, I’m sorry.
A．not smokingB．not smokeC．not to smokeD．don’t smoke
B
本题中情态动词could后应跟动词原形，否定形式只需在could后加not，或在主要谓语动词前加not，故本题选B。
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