问题
When did you become a volunteer for the elderly?– Two years ago. I ______ this group since then.
A:joined
B:took part in
C:have joined
D:have been in
B:took part in
C:have joined
D:have been in
正确答案是：
同类题型
Have you read the news _____ the newspaper?[ ]
Joan together with her parents ____ going to visit the Summer Palace this Saturday.
What are you going to do?—I will buy a book________.[ ]
When did you come back from Beijing?- _____the morning of April 18th.[ ]
When he moved to Germany in ______, he was already in _________.