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](/uploads/image/z/9549072-0-2.jpg?t=we%27ve+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
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.