Last night, before the exam, I went over the lessons_______I couldn’t keep my ey

题干

Last night, before the exam, I went over the lessons_______I couldn’t keep my eyes open to stay awake any longer．

A．before

B．until

C．unless

D．when

上一题下一题 0.85难度单项选择更新时间:2010-07-25 01:02:46

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