--What did he say?----He asked for the book.A. how much did I payB. I paid how muchC.

问题补充：

----What did he say?

----He asked for the book.

A. how much did I pay

B. I paid how much

C. did I pay how much

D. how much I paid

答案：

A. how much did I pay

B. I paid how much

C. did I pay how much

(答案→)D. how much I paid

解析：考查宾语从句：句意：--他说什么了？--他问我为这本书付了多少钱？因为是宾语从句，所以语序是陈述句语序，排除AC，疑问词应该在前面，连接宾语从句，选D。