作业帮we've been living in Montreal since we .A.have graduated B.have been graduating C.graduated.D.gratuate V
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we've been living in Montreal since we .A.have graduated B.have been graduating C.graduated.D.gratuate V
we've been living in Montreal since we .
A.have graduated B.have been graduating C.graduated.D.gratuate
V
we've been living in Montreal since we .A.have graduated B.have been graduating C.graduated.D.gratuate V
c.graduated
since后面是past tense.是基本语法.