【題目】They did everything in their power to save the building dating back to the Qing Dynasty, but their efforts were .

A. in turnB. in time

C. in vainD. in need

【答案】C

【解析】

試題分析:句意：他們在能力范圍內(nèi)盡一切努力去挽救始于清朝時期的建筑，但是他們的努力是徒勞的。A輪流；B及時；C徒勞；D需要。根據(jù)but可知后面和前面內(nèi)容是轉折關系，選C。

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