--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，此句時態(tài)為現(xiàn)在完成時，故排除AB，又因為join為非延續(xù)性動詞不可與現(xiàn)在完成時連用，排除C，故選D
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