Mary ______ my letter; otherwise she would have replied befo

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Mary ______ my letter; otherwise she would have replied before now.
A.has received
B.ought to have received
C.couldn’t have received
D.shouldn’t have received
为什么不是D

这题选C
couldn't have done 意为“很可能还没做”,客观性强,相对于must have done （很可能做了）来说.
句子意思：玛丽可能还没有收到了我的信；否则她在此之前就回复了.【“她没有回复”是一个客观依据,虽然不能充分证明“她没有收到我的信”】
shouldn't have done 意为“应该还没做“,表达主观性强
She shouldn't have left work yet.I'll call her office.（她应该还没下班.我打她办公室电话看看.）

Mary ______ my letter; otherwise she would have replied befo 并说明原因,1.Mary my letter; otherwise she would have replied bef mary could not have received my letter,otherwise she would h Mary couldn't have received your letter;otherwise she___ to 英语翻译Mary couldn't have received my letter,or she should have 完成时态的用法mary couldn't have received my letter,or she have rep Tina ___ the truth,otherwise she would have told us. otherwise,I would have stayed alone in my small room with a She is ______.A.my aunt Mary B.aunt Mary C.Mary aunt ——that he hadn't replied my letter ,i asked my brother for a Mary was badly ill,otherwise,she our celebration yesterday If she were here , she would ______ my sadness