his mother()the party last year.she()a party member for a yearA.joined,wasB.has joined,isC.joined,has beenD.has joined,has been

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his mother()the party last year.she()a party member for a yearA.joined,wasB.has joined,isC.joined,has beenD.has joined,has been

his mother()the party last year.she()a party member for a yearA.joined,wasB.has joined,isC.joined,has beenD.has joined,has been
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

his mother()the party last year.she()a party member for a yearA.joined,wasB.has joined,isC.joined,has beenD.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"

C