He asked me how often I went back home _____ a visit when I was

He asked me how often I went back home _____ a visit when I was at college.
A、for
B、on
C、with
D、to
【正确答案】：A
【题目解析】：本题考查介词辨析。句意：他问我上学时多久回家看一次；for作介词，表示目的。for a visit意为“访问，做客”，此处表示回家看看。