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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