can’t have been与couldn’t have been的区别?
can’t have been与couldn’t have been的区别?
关于can't have been的句子
can't have been和must have been
can’t / couldn’t have
英语翻译A.can't have been B.mustn't have been C.shouldn't have b
It couldn't have been on the moon.
He can't have been ill.
用can't have been造句!
能否解释一下musn't,needn't ,don't have to,can't ,couldn't的区别?
couldn't have done与couldn't区别
can't have been和can' have done有什么区别
can't与couldn't的区别