Theory is based on practice and______serves and guides practice.A、in turnB、by t

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问题 Theory is based on practice and______serves and guides practice.

选项 A、in turn
B、by turns
C、in return
D、taking turns

答案 A

解析动词词组辨析。in turn“相应地，转而”；by turns“轮流；交替”；in return“作为(对……的)回报；作为回应”；taking turns“轮流；依次”。根据句意：理论建立在实践之上，反过来服务于实践。故答案为A。

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