His aunt’s letters him of those beautiful days when they used to live together in his hometown.
A. call up
B. call for
C. call on
D. call at
网友回答
(答案→)A. call up
B. call for
C. call on
D. call at
解析：call up“回忆、想起”；call for“需要、要求”；call on“号召、恳求、拜访(某人)”；call at“(到某地)访问”。