By the end of last year another new theme park completed in that area.A. was beingB. wo

问题补充：

By the end of last year, another new theme park completed in that area.

A. was being

B. would be

C. has been

D. had been

答案：

A. was being

B. would be

C. has been

(答案→)D. had been

解析：考查时态。句意：到去年年底，在那个区域又建起了另一个主题公园。可知叙述的是在过去已经完成的动作，故用过去完成时态。选D。