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【题目】Study hard, ______ you won't catch up with your classmates.
A.and
B.or
C.but
D.if

【答案】B
【解析】句意:努力学习吧,否则你将不能赶上你的同学。A. and并且,表示并列或递进;B. or或者,表示选择;否则,表示结果;C. but但是,表示转折;D. if如果,表示条件;是否,表示疑问。“否则”不能赶上同班同学。表示否定的结果,用or。故选B。

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