Mary ______ my letter; otherwise she would have replied before now.
1个回答
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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。)
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。)
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