Question

the books on the left are small

The books on the left are for small children whereas the books on the right are for _________.
A.grown-ups B.growns-up C.grown-up D.grown ups
为什么?
（1.14）

Answer 1

首先grown-up是固定搭配,所以率先排出D
因为grown-up是由grown与up两个词连接而成的,从构词法中可以看出,grown为过去分词,而up为介词,英语中有不成文的规定,当这个符合词中没有中心词（即名词）时,s要加在最后.所以选A