----Did you _________ your friend when you were in Beijing?---No. But I _________ my aunt’s during my stay thereA.call on; called onB.call at; called atC.call on; called atD.call at; called on
网友回答
C解析考查短语：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。