I___to my brother since last summer.A.didn`t write B.hadn`t written C.haven`t written D.don`t write

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I___tomybrothersincelastsummer.A.didn`twriteB.hadn`twrittenC.haven`twrittenD.don`twriteI___tomybroth

I___to my brother since last summer.A.didn`t write B.hadn`t written C.haven`t written D.don`t write
I___to my brother since last summer.A.didn`t write B.hadn`t written C.haven`t written D.don`t write

I___to my brother since last summer.A.didn`t write B.hadn`t written C.haven`t written D.don`t write
C
since 主句用完成时态

I_C__to my brother since last summer.A.didn`t write B.hadn`t written C.haven`t written D.don`t write
since用现在完成时态
希望能够帮到楼主