此类推，所有的时态考题可轻易拿下，本质上还是根据语义做题。知道了这个原理，试着做一下这道题（2008年全国卷）

27. - Have you known Dr. Jackson for a long time?

-Yes, since she ______ the Chinese Society.

A. has joined B. joins C. had joined D. joined

3、介词的理解

介词的重要性毋庸置疑，无论是单选还是完形，甚至写作用好了介词，能够盘活一篇枯燥的作文，其作用比语法实用，考试可以不做语法分析，但是不能对介词不理解。我们学习介词的过程中始终只记得意思或者作为一个固定搭配词组的附属词记忆，这都是本末倒置的，一个固定搭配或词组的灵魂在介词，而不是这个动词，希望大家从意思上去从新理解介词，掌握他的特性。关于的理解我就不多说了，之前放过视频自己看看吧。

4、选择题实战技巧

阅读我不说了，大家请看：如何在水平不够的情况下做英语阅读

选择题，从头到尾充满了暗示点，就如上一题黑体字部分就直接给了选项暗示。这里我直接从网上拔一篇完形填空，不给大家答案，但是给出暗示点，来说明如何做选择题。

The Florida sun baked my shoulders as I worked along the I-595 freeway near Fort Lauderdale, picking up rubbish. I paused to 36 the sweat off my forehead and look up at the cloudless blue sky." 37 can't it rain?" I thought. That would 38 things down.

I thought about my 39 , who were probably sitting in an air-conditioned 40 right now. I'd had some problems in school, 41 my parents decided to let me 42 full-time with my dad, We both worked for my uncle, who had taken 43 of a maintenance（道路养护）company. It was up to us to keep the roads 44 of rubbish. The job was 45 and dirty, especially on hot days 46 this. I wondered why I ever agreed to do it.