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

--How often do you eat out?
-- , but usually once a week.
A. Have no idea
B. It depends
C. As usual
D. Generally speaking

A. Have no idea(答案→)B. It dependsC. As usualD. Generally speaking解析：考查交际用语。A不知道；B看情况；C和平时一样；D一般说来。句意：—你多久出去吃一次饭？—看情况，但通常是一周一次。根据句意说明B正确。

就是这个解释