---How much did you for the book?-Twenty yuan. A payB cost C takeD spend

问题补充：

---How much did you for the book? ---Twenty yuan.

A payB cost C takeD spend

答案：

解析：这四个选项都与花钱有关。Pay的意思是付款；cost的意思是花费，主语是物；take常用于句型it takes sb sth to do句型；spend也是花费的意思，但是主语必须是人。句意：你为这本书付了多少钱？——20元。可知选A。