By the end of last year another new gymnasium in Beijing
A. would be pleted
B. was being pleted
C. has been pleted
D. had been pleted
网友回答
A. would be pleted
B. was being pleted
C. has been pleted
(答案→)D. had been pleted
解析：本题考查时态。by the end of 后接表示过去的时间在句中作时间状语时，句子谓语动词使用过去完成时。