They did everything in their power to save the building dating back to the Qing

题干

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 time
C．in vain	D．in need

上一题下一题 0.64难度单项选择更新时间:2014-05-30 05:27:30

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