问题补充：
By the end of last year, another new gymnasium in London.
A. have been completed
B. were completed
C. had been completed
D. was completed
答案：
A. have been completed
B. were completed
C. had been completed
D. was completed
解析：本题主要考查过去完成时的被动语态。句中的by the end of last year表示“截止到去年年末，是已过去的时间为参照对已完成的事情进行总结，故应使用过去完成时；其次，句中的new gymnasium 与complete之间存在被关系。故选择C。
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