Look!The girl is swimming so fast.I___she__swim

问题描述:

Look!The girl is swimming so fast.I___she__swim
A know,can't b knew ,can't c don'tknow,can d didn't know,could

这道题选B.根据句意,“看!那个女孩游得好快啊.我还不知道她会游泳呢!”
因为事实是她会游泳,所以she could swim,说这句话时,“不知道”属于过去动作,现在已经知道了,所以用didn't know.选B.