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A clean environment can help the city bid for the Olympics, which ____ will promote its economic development.

A. in nature          B. in return           C. in turn   D. in fact

C. 

解析:短语辨析。in turn 在这儿表示:相应地,转而。如:Increased production will, in turn, lead to increased profits.增加生产会继而增加利润。另外in turn 还可以表示“轮流”。

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