--- You don't look well. What's the matter, Jack?--- Last night I watched the football match and didn't go to bed ________ midnight.A.whileB.whenC.untilD.since
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C解析while和when后接表示一段的时间状语从句,两者可通用,而since是“自从……”的意思,后接时间上的一点,since midnight自从半夜以来,用在此句中不合题意。所以只能选C