Question

You are not supposed ________ in public.
A. smoking   B. to smoke   C. to smoking

Answer 1

B

试题分析:考查固定短语be supposed to do 应该做某事。故选B。
点评：本题中to是不定式符号，不是介词，需注意区分。熟记一些基础短语、句式对答题有事半功倍的效果，平时注意积累。