28．[2010·河北衡水中学三模]_____ the chapter four times, I finally understood the author's theory．

　　　　 A．Reading　　 　　　　　 B．Having read　 　　　 C．To read　 　　　　　　　 D．Read

28B考查非谓语动词的用法。根据句意：read动作应发生在understand前，故用现在分词的完成时；I 和read之间是主动关系，故用现在分词状语。

27.A考查非谓语动词的用法。此处过去分词短语driven by greater demand of vegetables作原因状语。

27. [2010·拉萨中学6次月考]_______ by greater demand of vegetables, farmers have built more green houses.

A. Driven　　　 B. Being driven　　　 C. To drive　　　 D. Having driven

26．[2010·成都三诊]Our monitor，　　　 it clear to us that he didn’t want to waste time playing computer games-left the Internet bar quickly.

A．made　　 　　　　　　　 B．having made　 　　　 C．making　　 　　　　　　 D．had made

26B考查非谓语动词的用法。本句可改为：Having made it clear to us that he didn’t want to waste time playing computer games，our monitor left the Internet bar quickly。先声明然后再离开，故用现在分词的完成时。

25. [2010·河北唐山一模]_______60 miles a day, you need your mountain bike in a very good state.

A. Cover　　 B. Covered　　 C. To cover　　 D. Having covered

25C 考查不定式作状语。句意：为了每天行60英里，你的山地车需要好的车况。

24. [2010·江苏泰兴高三调研测试] He hurried to the hotel, only _________ his girlfriend had left.

A. to tell　　 　 B. to be told　 　　　 C. telling　 　　 D. told

24B考查不定式作结果状语。句意：他急匆匆地到达旅馆却意外发现他的女朋友已经离开了。此处不定式作状语表意外的结果。

23.[2010·上海市四区高三二模] _______ more about Participant Service of Expo 2010, Shanghai China, call Hotline +86-21-962010.

A. To find out　 　　　 B. Finding out

C. Find out　　　　 D. Having found out

23A 考查不定式作状语。此处不定式to find out表目的。　　　

22.[2010·上海市虹口区高三二模]Ted and his friends established a website offering useful information about thunderstorms ______ similar accidents happening.

A. prevent　　　 B. preventing　　 C. to prevent 　　　　 D. prevented

22C考查不定式作目的状语。句意：泰德和他的朋友们建立一个提供有关雷雨信息的网站以避免类似事故的发生。根据句意选C。

21.[2010·上海市徐汇区高三二模]　　 ______ the growing number of patients, the clinic had to extend its service from five days to seven days a week.

A. To accommodate　　 　　 B. Accommodating

C. Being accommodated　　　　　　 　　D. Accommodated

21A考查不定式作目的状语。句意：为满足不断增长的病人的要求，诊所不得不把他们的服务由一周五天增加到七天。

20. [2010·江苏省高考一模]To greatly raise people’s living conditions, _______.

A. all kinds of measures have taken

B. they have taken all kinds of measures

C. it is said that they have taken all kinds of measures

D. I think they have taken all kinds of measures

20 B分析语境可知，为了提高人民生活水平的逻辑主语应为“他们”，因此应用they做主句主语。不定式做目的状语时，其逻辑主语应为主句主语。