问题补充：
Lily with her parents Oxfam since two years ago.
A. has joined
B. have joined
C. has been in
D. have been in
答案：
A. has joined
B. have joined
C. has been in
D. have been in
解析：句意：莉莉和她的父母在两年前就已经加入了施乐会。结合语境可知本句描述的是已经持续了两年的动作，故用现在完成时态。with her parents是伴随主语，真正主语是莉莉，故助动词用单数。瞬间动词不能和持续性时间状语连用，选项AC，表示瞬间动作，故选C。
