问题补充：
To get a better view of the stage, .
A. our seats had to be changed
B. we had to change our seats
C. our seats were changed
D. our seats will be changed by us
答案：
A. our seats had to be changed
(答案→)B. we had to change our seats
C. our seats were changed
D. our seats will be changed by us
解析：可联系答.案.网客服索取。
