问题
选择题
----Did you _________ your friend when you were in Beijing?
---No. But I _________ my aunt’s during my stay there.
A．call on; called on
B．call at; called at
C．call on; called at
D．call at; called on
答案
答案：C
考查短语：call on sb 拜访某人，call at 拜访某地，句意：当你在北京的时候你拜访了你的朋友了吗？没有，但是在我停留在那的日子我拜访了我姑姑家。所以选C。