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】說話者A說/她想買那臺冰箱，但是還缺l00美元。說話者B說如果說話者A能在周末前把錢還給他/她，就同意借錢給他/她。四個選項中，A項動詞borrow表示“借入”，不合題意，C項語氣錯誤，D項時態錯誤。因此，B項為正確答案。