Theory is based on practice and ________ serves practice.
A．in turnB．by and by
C．by chanceD．in this case
A
短語(yǔ)辨析. A.依次;輪流    B. 不久以后C. 意外的  D.既然這樣.句意:理論基于實(shí)踐并反過(guò)來(lái)為實(shí)踐服務(wù).結(jié)合語(yǔ)境可知選A.
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