As is known to all , theory is based on practice and _______ serves practice.
A．by chanceB．by turnC．in returnD．in turn
D
短語辨析。by chance偶然；by turn輪流；in return作為回報；in turn輪流，依次，轉(zhuǎn)而，反過來。句意：眾所周知，理論以實踐為基礎(chǔ)，反過來又應(yīng)用于實踐。所以選D。
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