It surprised us all good manners the monitor had. A. thatB. whichC. whatD. how

问题补充：

It surprised us all good manners the monitor had.

A. that

B. which

C. what

D. how

答案：

A. that

B. which

(答案→)C. what

D. how

解析：考察主语从句。It是形式主语，What引导起主语从句，what good manners一起作为had的宾语。