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You have failed two tests. You’d better start working harder, ____ you won’t pass the course.
A.andB.soC.butD.or
D
    
试题分析: 句意:——你已经两次考试不及格了。你最好现在开始努力,否则你这会挂科的。A并且;B所以;C但是;D否则。从句意可知此处指如果不努力将出现的结果,是对对方的警告,故答案选D。
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