Question

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

Answer 1

B

試題分析:考查固定短語be supposed to do 應該做某事。故選B。
點評：本題中to是不定式符號，不是介詞，需注意區分。熟記一些基礎短語、句式對答題有事半功倍的效果，平時注意積累。