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As is known to all , theory is based on practice and _______ serves practice.
A.by chanceB.by turnC.in returnD.in turn
D
短语辨析。by chance偶然;by turn轮流;in return作为回报;in turn轮流,依次,转而,反过来。句意:众所周知,理论以实践为基础,反过来又应用于实践。所以选D。
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