People of _____kind fall into ______same group and things of _____kind flock together.

问题描述:

People of _____kind fall into ______same group and things of _____kind flock together.
A.the; the; the B.a; the; a C.a; /; a D.the; a; the

B
物以类聚人以群分.为什么第一个和第三个空填a一类的,一种的,这里并不是特指