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Heseldomstaysuplateatnight,

练习题1.31W

问题详情:

Heseldomstaysuplateatnight,

He seldom stays up late at night, _______ he has too much work to do.

         A. if         B. unless         C. until      D. while

【回答】

B

知识点:连词

题型:选择题

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