--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
由“since then”可知，此句時(shí)態(tài)為現(xiàn)在完成時(shí)，故排除AB，又因?yàn)閖oin為非延續(xù)性動(dòng)詞不可與現(xiàn)在完成時(shí)連用，排除C，故選D
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