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Work hard at your lessons, ______ you’ll fail the exams again.
A.andB.butC.otherwiseD.besides
C

试题分析:考查连词用法。A并且;B但是;C否则;D此外。从句意可知后句是一种警告,表示如果不努力,将要出现的结果。所以C选项正确。句意:努力学习你的功课,否则你会再次考不及格的。
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