---How often do you eat out?
--- , but usually once a week.
A. Have no idea
B. As usual
C. It depends
D. Generally speaking
网友回答
A. Have no idea
B. As usual
(答案→)C. It depends
D. Generally speaking
解析：考查交际用语：A. Have no idea不知道，B. As usual象平常一样，C. It depends那就看情况而定了，D. Generally speaking一般来说，句意是：--你多长时间出去吃一次？--那就看情况而定了，但通常是一周一次。选C。