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Theoryisbasedonpracticeandservespractice.A.inturnB.byturnsC.inreturn哪个正确?

题目详情
Theory is based on practice and ____ serves practice.A.in turn B.by turns C.in return 哪个正确?
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答案和解析
A in turn, “依次,反过来,轮流”, in return “报复,回报”; by turns “轮流,交替”. 思想基于实践,反过来也用于实践.