--Whendidyoubecomeavolunteerfortheelderly?--Twoyearsago.I______thisg

发布时间：2020-08-14 07:39:48

--When did you bee a volunteer for the elderly?-- Two years ago. I ______ this group since thenA.joinedB.took part inC.have joinedD.have been in

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D解析由“since then”可知，此句时态为现在完成时，故排除AB，又因为join为非延续性动词不可与现在完成时连用，排除C，故选D
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