—How often do you call your parents?
— , but usually once a week.
A. Forget it
B. Once in a while
C. It depends
D. I’ve no idea
网友回答
A. Forget it
B. Once in a while
(答案→)C. It depends
D. I’ve no idea
解析：
试题分析:考查习惯用语。A忘了吧，别想了；B偶尔；C看情况而定；D我不知道。从后句but usually once a week的转折可知C选项正确。句意：--你多久给父母打次电话呢？---看情况而定，但是经常是一周一次。