I've looked for my pen everywhere,but I find it.A.couldn't B.can't C.mustn't D.didn't

问题描述:

I've looked for my pen everywhere,but I find it.A.couldn't B.can't C.mustn't D.didn't

B.can'tA为啥错现在完成时作为前提,相当于现在还在持续,因此不能用过去时来结尾。