-Where is my book?-Oh,here it is!I'm sorry I forgot ___it from you

问题描述:

-Where is my book?-Oh,here it is!I'm sorry I forgot ___it from you
A.to borrow B.borrowing C.to lend D.lending

C,D两个选项首先被排除,因为lend一定要与"to"搭配使用;
根据句子的意思,说的是我忘了跟你借了一本书,并把这本书落在了这里.
所以选B.
forget doing sth表示忘记做过某事(已做了);
forget to do sth则表示忘记去做某事(还没做).