31页35.Pollution is more and more serious than before .sure .

问题描述：

31页35.Pollution is more and more serious than before .sure .Peple should ------------cutting trees
A.prevent B.be prevented C.be kept 理由
1个回答 分类：英语 2014-09-27

问题解答：

我来补答
B
人们应该被阻止砍伐树木.
prevent sb.(from) doing sth.被动形式是be prevent (from) doing sth.其中from可以省略
而如果用keep 则不能省略from 必须说be kept from doing sth.
 
 
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