-When did you become a volunteer for the elderly?-Two years ago. I ______ this group since then.[ ]A. joinedB. took part inC. have joinedD. have been in-初中英语-魔方格

◎ 题干

-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

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◎ 解析

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◎ 知识点

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