the poor are getting poorer,the rich richer这里为什么用are,the poor表示一类人,不是用is么

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• the poor are getting poorer,the rich richer这里为什么用are,the poor表示一类人,不是用is么
• I forget how old was I at that time和I forget how old I was at that time哪句错了如果都对,那两句有什么区别?
• more and more rich,richer and richer,more rich and more rich的区别Famers have become ___ in our hometown in recent years.A.more and more richB.richer and richerC.more rich and more rich这题答案是B,但为什么不能用A或C,