题目内容：

take a look at that car,it must have been expensive,为什么用have been?
为啥不说it must be expensive?

优质解答

Take a look at that car,it must have been expensive,为什么用have been?为啥不说it must be expensive?答：It must be expensive.是对现在情况的肯定推测：这车一定很贵.It must have been expensive.是对过去情...