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【题目】Relax yourself every day,__________ you'll be too tired to get good grades.

A. and

B. or

C. for

D. but

【答案】B

【解析】句意:每天放松自己,否则,你就会太累而无法取得好的成绩。这是祈使句+and/or+陈述句,根据句意,“否则”用or。

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