As is known to us all, theory practice and in turn serves practice.——青夏教育精英家教网—

摘要： As is known to us all, theory practice and in turn serves practice.

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As is known to us all, theory is based on practice and __________ serves practice.

A. by chance　　　　 B. in turn 　　　　　　　　　　 C. in return　　　　　　 D. by turn

A. by chance　　　　 B. in turn 　　　　　　　　　　 C. in return　　　　　　 D. by turn

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