---Will people use money 100 years?-No they won’t. Everything will free.A. in \B. fo

问题补充：

---Will people use money 100 years?

---No, they won’t. Everything will free.

A. in, \

B. for, is

C. in , be

D. since, be

答案：

A. in, \

B. for, is

(答案→)C. in , be

D. since, be

解析：考查介词。句意：----100年后，人们将会用钱吗？----不，人们将不会用钱。一切将是免费的。故选C。