書名：國際學村新多益閱讀題庫解析
頁數：P.7
題目：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
疑問：為什麼是C 不是B
每次在寫文法題 我都不知道題目在考我哪方面的問題
所以不知道要怎麼查文法書 ~"~