题目内容
20．I didn't go to bed ________ my mother came back late last night．（ ）| A． | so | B． | until | C． | though |
分析 昨天晚上直到我妈妈回来我才去睡觉．
解答 答案：B．
联系语境并根据前后句子的对比，可知本句应理解为：昨天晚上直到我妈妈回来我才去睡觉．；结合关键词 didn't，可以判断出此句应用固定表达not…until来完成，意为"直到…才…"引导一个时间状语从句．故选B
点评 比较和分析选项中连词的不同含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．
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