–Did you your sister when you were in Shanghai?
--No. But I my uncle’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
网友回答
A. call on, called on
B. call at, called at
(答案→)C. call on, called at
D. call at, called on
解析：可联系答.案.网客服索取。