his mother()the party last year.she()a party member for a year

问题描述:

his mother()the party last year.she()a party member for a year
A.joined,was
B.has joined,is
C.joined,has been
D.has joined,has been

选C
前一句是过去时.后一句是完成时.
意思是"他的妈妈去年入党了,她已经是一年的党员了"