2014
高考英语单项选择精英系列训练题(17)及答案单项选择 1.( 2012•江苏栟茶中学调研)i warned him of the slippery road, but he fell on fours ________ i finished my words. a.as b.before c.until d.since [解析]before 引出时间状语从句,意为“不等……就……”。 [答案]b 2.(2012•海淀区期中)the boy was so tired that he fell asleep ________ his mother could take off his clothes.