题目内容
12.Cigarettes must ______ before you go into a room.( )| A. | put out | B. | be put out | C. | put up | D. | be put up |
分析 句意为:你进屋前必须掐掉烟.
解答 短语put out熄灭;put up举起;张贴.cigarettes作主语,为动作的承受者,应该用被动语态;由主语cigarettes可知应用be put out.故选B.
点评 本题考查动词短语辨析.must是情态动词,含有情态动词的被动语态结构为:情态动词+be+V的过去分词.
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