◎ 题干
— When did you become a volunteer?
— Two years ago. I _____this group since then.

[     ]

A. have joined in
B. have taken part in
C. have been in
D. have been to
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“— When did you become a volunteer?— Two years ago. I _____this group since then.[ ]A. have joined in B. have taken part in C. have been in D. have been to…”主要考查了你对  【现在完成进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。