__________,they provide a rapid means of getting information about many people.A.Properly be used B.Properly used C.If u
__________,they provide a rapid means of getting information about many people.A.Properly be used B.Properly used C.If use it properly D.Been properly used 原因要讲清楚
英语人气：145 ℃时间：2019-10-19 15:02:56
优质解答
选c.这里面省略了主语They,因为后面有they,所以可以省略.然而一个句子不能有两个动词,所以A不选.B中把他省略的东西补上就是It is properly used.主语是it 与后面的主语不一样,不能省.没有D这种用法
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