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