the room is in the terrible mess ,it can not have been cleaned .为什么用can not have been

问题描述:

the room is in the terrible mess ,it can not have been cleaned .为什么用can not have been
为什么不用should not have been

因为can’thave done 的意思是(过去)肯定没有做某事,而且在句子中要表示被动,所以用been cleaned