They are forbidden for they are still middle school students.A. to smokingB. to smokeC. s

问题补充：

They are forbidden ,for they are still middle school students.

A. to smoking

B. to smoke

C. smoked

D. smoke

答案：

解析：考查非谓语动词。forbid sb. to do sth.= forbid doing sth.“禁止做某事”。句意“他们被禁止吸烟，因为他们还是中学生。”故选B。