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Relax yourself every day, ________ you'll be too tired to get good grades.

A.andB.orC.forD.but

B

解析试题分析:本题中含有特殊句式:祈使句+连词+陈述句=If引导的条件句+主句。这个句型进一步转换成:名词短语+连词+陈述句。如果原句中的连词是and,那么可以转换成一个肯定的条件句;如果原句中的连词是or,可以转换成一个否定的祈使句。本句相当于:If you don’t relax yourself every day, you'll be too tired to get good grades.故B正确。
考点:考察特殊句式中的连词

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