【題目】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,否則,你就會太累而無法取得好的成績。這是祈使句+and/or+陳述句,根據(jù)句意,“否則”用or。

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