---How often do you visit your father in the village?
---I feel ashamed．Just ．
A. often
B. by accident
C. once in a while
D. all of a sudden
网友回答
A. often
B. by accident
(答案→)C. once in a while
D. all of a sudden
解析：时间副词辨析。Often经常，常常；by accident偶然，意外的；once in a while 偶尔，有时；all of a sudden突然地，出乎意料的。句意：你多久拜访一次你农村的父亲？不好意思。只是偶尔。结合语境可知选C。