--Could you please in the room?Oh I’m sorry.A. not smokingB. not smokeC. not to smoke

问题补充：

--Could you please in the room?

--Oh, I’m sorry.

A. not smoking

B. not smoke

C. not to smoke

D. don’t smoke

答案：

A. not smoking

(答案→)B. not smoke

C. not to smoke

D. don’t smoke

解析：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。