问题
选择题
— When did you become a volunteer?
— Two years ago. I _____ this group since then. [ ]
A. joined
B. have joined
C. have been in
答案
答案：C
搜题请搜索小程序“爱下问搜题”
— When did you become a volunteer?
— Two years ago. I _____ this group since then. [ ]
A. joined
B. have joined
C. have been in
答案：C