You have failed two tests. You’d better start working harder, ______ you won’t pass the course.

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问题 You have failed two tests. You’d better start working harder, ______ you won’t pass the course.

选项 A、and
B、but
C、or
D、so

答案C

解析 连词。根据句意可知应选择C(否则)。你已经两次考试不及格了。你最好努力学习,否则你将不能通过考试。
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