What do you often do Sunday morning?A. onB. inC. atD. for

问题补充：

What do you often do Sunday morning?

A. on

B. in

C. at

D. for

答案：

A. on

B. in

C. at

D. for

解析：考查固定搭配。 Sunday morning，在具体哪一天的早晨用介词on，所以选A。