---How often do you eat out?- but usually once a week.A. Have no ideaB. As usualC. It

问题补充：

---How often do you eat out?

---, but usually once a week.

A. Have no idea

B. As usual

C. It depends

D. Generally speaking

答案：

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。