问题补充：
The big building construction will be a shopping mall in the city.
A. in
B. under
C. over
D. during
答案：
A. in
(答案→)B. under
C. over
D. during
解析：考查介词：under construction：在建设中，句意：正在建设中这个大楼将是城里的购物中心。选B。
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