--- How often do you work out?
--- , but usually once a week.
A. Have no idea.
B. It depends.
C. As usual.
D. Generally speaking.
网友回答
A. Have no idea.
(答案→)B. It depends.
C. As usual.
D. Generally speaking.
解析：交际用语。A不知道；B看情况；C和平时一样；D一般说来；结合句意可知B正确。句意：—你多久锻炼一次？—看情况。但是通常是一周一次。