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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

答案
B
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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试题【Last night, before the exam, I went over the lessons_______I couldn’t keep my ey】;主要考察你对连词等知识点的理解。[详细]
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