—I wonder how much you for your services.-Well the first two are free while the third

问题补充：

—I wonder how much you for your services.

---Well, the first two are free while the third costs $30 .

A. bargain

B. charge

C. offer

D. donate

答案：

A. bargain

(答案→)B. charge

C. offer

D. donate

解析：考查动词：A. bargain 讨价还价B. charge要价C. offer提供D. donate捐款，句意：--我想知道你的服务要价多少？--前面两次是免费的。第三次30美元。选B。