"That latest car must have cost you a pretty penny.""Oh ,no,----" it ,didn`t.是不是虚拟语气的否定回答呢,must have done,要一一的去掉后剩下过去式cost ,所以要用过去式?、

"That latest car must have cost you a pretty penny.""Oh ,no,----" it ,didn`t.是不是虚拟语气的否定回答呢,must have done,要一一的去掉后剩下过去式cost ,所以要用过去式?、
"That latest car must have cost you a pretty penny.""Oh ,no,----" it ,didn`t
.是不是虚拟语气的否定回答呢,must have done,要一一的去掉后剩下过去式cost ,所以要用过去式?、

"That latest car must have cost you a pretty penny.""Oh ,no,----" it ,didn`t.是不是虚拟语气的否定回答呢,must have done,要一一的去掉后剩下过去式cost ,所以要用过去式?、
must have cost 这是情态动词must加现在完成时,表达对过去的肯定性推测,还不是虚拟,只是表明了时态是过去式,因此用过去式回答,no ,it didn't