【单选题】
One cannot learn a foreign language well ___he studies hard.
A. unless
B. if
C. as
D. when
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答案
A
解析
暂无解析
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所谓自动控制，就是在没有人直接参与的情况下，利用控制装置，对生产过程、工艺参数、技术指标、目标要求等进行自动调节与控制，使之按期望规律或预定程序进行的控制系统
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