As is known to all , theory is based on practice and _______ serves practice.A．b_刷题宝

题干

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

A．by chance

B．by turn

C．in return

D．in turn

上一题下一题 0.85难度单项选择更新时间:2010-07-06 10:38:24

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