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You have failed two tests. You’d better start working harder, ____ you won’t pass the course.
A.andB.orC.butD.so
B
考查连词。and 和,并且; or 否则,或者;but但是;so因此。句意:你已经两次考试不及格了。你最好开始努力学习,否则你不可能通过这门课程。故选B。
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