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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

C

解析试题分析:句意:他们在能力范围内尽一切努力去挽救始于清朝时期的建筑,但是他们的努力是徒劳的。A轮流;B及时;C徒劳;D需要。根据but可知后面和前面内容是转折关系,选C。
考点:考查短语辨析。

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