并说明原因,1.Mary my letter; otherwise she would have replied bef

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并说明原因,
1.Mary my letter; otherwise she would have replied before now.
A.couldn't have received B.ought to have received D.shouldn't have received.
2.My pain apparent the moment i walked into the room,for the first man i met asked sympathetically:"are you feeling all right?" a.Must be B.had been C.must have been D.had to be

1、couldn't have done指不可能做了某事,ought to have done指应该做了某事,shouldn't have done指本不该做却做了某事,根据原文的后半句“否则她会在现在之前就回复了”,A为正确答案.
2、根据后半句时态可知,“我的疼痛很明显”发生在过去,对the first man说的are you feeling all right表推测,所以答案为C,大意是“我的疼痛在我进门时一定很明显,因为我见到的第一个人同情地问我‘还好吗?’”.

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