Last night, before the exam, I went over the lessonsI couldn’t keep my eyes open to stay a

发布时间：2020-08-15 01:25:13


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

网友回答

A. before
(答案→)B. until
C. unless
D. when
解析：考查状语从句。语境表示“直到我再也难以支撑的时候”，用until引导时间状语从句表示“直到……的时候”。
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