书名：国际学村新多益阅读题库解析
页数：P.7
题目：Rather than having separate ____ celebration, MetroVox will host a
joint event at the end of the mouth to honor those who are leaving.
A. retire
B. retired
C. retirement
D. retires
疑问：为什么是C 不是B
每次在写文法题 我都不知道题目在考我哪方面的问题
所以不知道要怎么查文法书 ~"~