顾颉刚的古史观主要是从上古史关于尧舜禹的地位问题，以及有关传说的演变中，认为上古史是层累地造成的。即“（）”说。

You________all those clothes!We have a washing machine to do that sort of thing.[ ]

A. needn't have washed  

B. shouldn't have washed

C. must not have washed  

D. can not have washed