Question

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

A. and

B. or

C. for

D. but

Answer 1

【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。