I am sorry ,I forgot ( ) his money A to borrow B borrow C borrowing D borrowed

问题描述:

I am sorry ,I forgot ( ) his money A to borrow B borrow C borrowing D borrowed

c forget后面加doing表示忘记做过某事,加to do 表示忘记去做某事
这里先表达的是我忘了借过他钱的事情了,因为句子开头有说很抱歉.