Speaker A: I'd like to buy the refrigerator, but I'm one hundred dollars short.

Speaker B: __________if you promise to give it back before this weekend.

A. I'll borrow you the money

B. I'll lend you the money

C. I'd lend you the money

D. I will have lent you the money

B【解析】说话者A说/她想买那台冰箱，但是还缺l00美元。说话者B说如果说话者A能在周末前把钱还给他/她，就同意借钱给他/她。四个选项中，A项动词borrow表示“借入”，不合题意，C项语气错误，D项时态错误。因此，B项为正确答案。