31．It will cost a city a lot to bid for the Olympics, in turn it will promote its economic d——青夏教育精英家教网—

摘要：31．It will cost a city a lot to bid for the Olympics, in turn it will promote its economic development. A. or B. since C. for D. but

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It will cost a city a lot to bid for the Olympics, _______ in turn it will promote its economic development.

A. or B. since C. for D. but

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