Students are ________．

A.prevented to smoke

B.forbidden to smoke

C.stopped to smoke

D.preventing from smoking

答案及解析： B

解析：

句意：禁止学生吸烟。prevent, stop的句式：sb．is/are prevented/stopped from doing，在这儿的形式不对；

sb．is/are forbidden to do某人被禁止做某事。