题目内容
13．-Jim，you look so tired!-Oh，I didn't go to bed ______ it was 12o'clock last night．（ ）
| A． | until | B． | as | C． | if |
分析 --吉姆，你看起来很疲劳啊！--哦，我昨天晚上一直到12点才睡觉．
解答 答案：A．until意思是"直到"引导时间状语从句，经常和not连用，构成结构"not…until…"意思是：直到…才…；as意思是"当…时"引导时间状语从句；if意思是"如果"引导条件状语从句．根据"I didn't go to bed"以及"it was 12o'clock last night"可知直到12点才上床睡觉，所以要用until，故选A．
点评 首先要掌握这几个连词的用法，然后结合具体的语句以及给出的选项，就可以确定正确答案．
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