题目内容：

In that county,the rich__richer,the poor ,poorer.
A.become B.has become C.becomes D.is becomeing

优质解答

A
这里主要考察的不是什么系动词而是名词的数.
the rich 和 the poor 都代表一类人作为复数看待,故谓语动词用复数形式.
类似的还有the dead ,the young,the old等都当复数看待.