问题标题:
与系动词有关的A:Therewerefourinthecarbesidesthedriver,andJanemanagedtotakeherkidaswell.B:Oh,dear,it()acomfortabletrip,Iguess.Acan'tbeBcouldn'thavebeenCmustn'tbeDwouldn'thavebeen是B还是D阿,为什么,
问题描述:

与系动词有关的

A:Therewerefourinthecarbesidesthedriver,andJanemanagedtotakeherkidaswell.

B:Oh,dear,it()acomfortabletrip,Iguess.

Acan'tbeBcouldn'thavebeenCmustn'tbeDwouldn'thavebeen

是B还是D阿,为什么,

牛俊邦回答:
  Bcouldn'thavebeen   时态是过去的(因为是对过去事件的猜测)   猜测的否定形式要用can/could
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《与系动词有关的A:Therewerefourinthecarbesidesthedriver,andJanemanagedtotakeherkidaswell.B:Oh,dear,it()acomfortabletrip,Iguess.Acan'tbeBcouldn'thavebeenCmustn'tbeDwouldn'thavebeen是B还是D阿,为什么,|小学英语问答-字典翻译问答网》
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