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,

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 rich
B.richer and richer
C.more rich and more rich
这题答案是B,但为什么不能用A或C,