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

試題分析:考查固定短語(yǔ)be supposed to do 應(yīng)該做某事。故選B。
點(diǎn)評(píng)：本題中to是不定式符號(hào)，不是介詞，需注意區(qū)分。熟記一些基礎(chǔ)短語(yǔ)、句式對(duì)答題有事半功倍的效果，平時(shí)注意積累。
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