题目内容

--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
D
有since短语或从句修饰主语通常用完成时，结构为have+过去分词，但在完成时
短暂动词不能和时间状语连用，join属于短暂动词，故只能选D。
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