问题补充：
By the end of last year, another new gymnasiumin Beijing.
A. would be completed
B. was being completed
C. has been completed
D. had been completed
答案：
A. would be completed
B. was being completed
C. has been completed
(答案→)D. had been completed
解析：考察时态。By与完成时连用，本题by后面的是过去时的时间状语，故使用过去完成时，故D正确。
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