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11.(2012 佛山,32) Air must       fresh all the time. It’s good for our health.

   A. keep   B. is kept   C. be kept 

11. C

11. C

句意:空气必须一直保持新鲜。这对我们的健康有益。本题考查动词的语态。含情态动词的被动语态结构为must + be +过去分词。

题目来源:2016年5年中考3年模拟中考英语广东专用 > 专题十一 动词的语态

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