1、第 16天notuntil高考频度： 难易程度：1. (2017北京) If you dont understand something, you may research, study, and talk to other people _ you figure it out.A. because B. though C. until D. since【参考答案】C【试题解析】考查连词。句意：如果你无法理解某个东西，你可能会研究，学习和他人探讨直到你解决为止。until 直到，根据句意可知选 C。2. (2016江苏) Not until recently _ the development
2、 of tourist-related activities in the rural areas.A. they had encouraged B. had they encouragedC. did they encourage D. they encouraged【参考答案】C【拓展延伸】not until表示直到才，其用法如下：(1)until引导时间状语从句，如果主句的谓语动词是延续性的，那么这个主句需用肯定式。若主句的谓语动词是非延续性的，则主句常用否定式，构成 not.until.结构。(2)在 not.until.句型结构中，可以把 not until提到句首，句子用倒装语序。
3、(3)not until引导的时间状语从句位于句首时，主句部分用倒装语序。(4)not.until.句型的强调句式为：Its not until.that.(5)not until引导的状语从句用于 It is/wasthat句式中被强调时，主句不再用倒装语序。It didnt stop raining until the end of last month. 在上月底之前，雨从未停止。It was not until 1911 that the first of the vitamins was identified. 直到 1911年才发现了第一种维生素。1. Not until he got seriously ill _ the importance of health.A. did he realize B. he realized C. had he realizedD. he had realized2. 完成句子You _(才知道)what you can achieve _ (尝试后).It was _(直到昨天)that I noticed it. Youll not achieve your goal _ you really _ to make it. 直到你真正下定决心去做成一件事时，你才会实现你的目标。贵有恒何必三更眠五更起，最无益只怕一日曝十日寒。_
