That teaching building_in the 1987 was the best at that time
A to be completed
B having been comlieted
C being completed
D completed
选D
人气：123 ℃ 时间：2019-08-22 14:48:47
解答
选D 是 which was completed 省略.
因为有具体时间1987,所以用过去时的被动态
A 是将被修建完
B 已经被建成
C 是正在建
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