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Theory is based on practice and ________ serves practice.
A.in turnB.by and by
C.by chanceD.in this case
A
短语辨析. A.依次;轮流    B. 不久以后C. 意外的  D.既然这样.句意:理论基于实践并反过来为实践服务.结合语境可知选A.
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