Sandy could do nothing but _____ to his teacher that he was wrong .A.admit B.admitted C.admitting D.to admit 答案是a，为什么不是d呢？

热心网友

我是没见过but后面带to

热心网友

"could do"和后面的"do"要一致。（个人意见）前面不是不定式，后面也不能是不定式。