Something necessary to prevent the serious air pollution．( )A．must doB．must be doneC．may doD．may be done 题目和参考答案——青夏教育精英家教网—

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15．Something necessary to prevent the serious air pollution．（　　）

A．

must do

B．

must be done

C．

may do

D．

may be done

分析必须采取必要的措施防止严重的空气污染．

解答答案：B．
首先根据语境推测句意是"必须采取必要的措施防止严重的空气污染．"，主语 Something necessary是动作do 的承受者，确定用被动语态，由句意判断用情态动词must，说明本题考查含有情态动词的被动语态，其构成是：主语+情态动词+be+动词的过去分词．故答案为：B

点评首先根据所给信息明确句意，从句意判断本题考查含有情态动词的被动语态，其构成是：主语+情态动词+be+动词的过去分词．

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