Question

You are not supposed ______ in public.

1. A.
   smoking
2. B.
   to smoke
3. 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。
考点：固定短语
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。