问题补充：
---- How often do you go to the concert ?
---- ,but at least once a month.
A. It depends
B. Have no idea.
C. As usual
D. Generally speaking.
答案：
(答案→)A. It depends
B. Have no idea.
C. As usual
D. Generally speaking.
解析：考查答案意思，It depends意思“这取决于”，Have no idea意思“不知道”，As usual意思“像往常一样”，Generally speaking意思“一般来说”，由前面的句子How often do you go to the concert ?意思“你经常去音乐会吗”，所以选A
