【題目】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:努力學(xué)習(xí)吧,否則你將不能趕上你的同學(xué)。A. and并且,表示并列或遞進(jìn);B. or或者,表示選擇;否則,表示結(jié)果;C. but但是,表示轉(zhuǎn)折;D. if如果,表示條件;是否,表示疑問。“否則”不能趕上同班同學(xué)。表示否定的結(jié)果,用or。故選B。

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