They did everything in their power to save the building dating back to the Qing Dynasty, but their e...
2022-11-22 19:24:47 122次 2013-2014学年天津市高三5月月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
They did everything in their power to save the building dating back to the Qing Dynasty, but their efforts were _______.
A. in turn B. in timeC. in vainD. in need
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