[例1]—— Did that book give the information you needed？

—— Yes，but______，we had to read it almost entirely.

A.for finding it　B.to find it

C.finding it　D.by finding it

【解析】答案B。不定式“to find it”作目的状语，“为了找到需要的信息，我们不得不把整本书读一遍”。

[例2]Charles Babbage is generally considered______the first computer.

A.to invent　B.inventing

C.to have invented　D.having invented

【解析】答案C。“通常人们认为是Charles Babbage发明了第一台计算机”，不定式“to have invited”作主语补足语。

[例3]There isn’t any difference between the two.I really don’t know____.

A.where to choose　B.which to choose

C.to choose what　D.to choose which

【解析】答案B。“这两者没有什么区别，我真的不知道选择哪一个”，不定式to choose作know的宾语。

[例4]What the scientist said greatly encouraged us______the experiment again，but his secretary’s words discouraged us______the experiment any more.

A.to try；to do　B.to try；from doing

C.for trying；from doing　D.trying；to do

【解析】答案B。“鼓励某人做某事”，用encourage sb to do sth.所以，第一个空填to try；相反，“不鼓励某人做某事”，用discourage sb from doing sth。

[例5]She felt it a great shame______so severely in the presence of her boy friend.

A.to criticize　B.to have criticized

C.to be criticized　D.to have been criticized

【解析】答案D。“她感觉在男朋友面前遭受如此严厉的批评真是一种耻辱”，不定式完成被动形式“to have been criticized”在此作宾语补足语。

[例6]John was made______the truck for a week as a punishment.

A.to wash　B.washing　C.wash　D.to be washing

【解析】答案A。“他被惩罚洗卡车一周”，“to wash”作主语补足语，原本是“make sb do sth”句型，在这用被动语态，不定式需要加不定式符号“to”。

[例7]Mr.Green has never smoked any more since his wife______him______.

A.suggested；to give it up　B.persuaded；to give up it

C.advised；to give it up　D.persuaded；to give it up

【解析】答案D。“自从格林先生的妻子说服让他戒烟后，格林先生再也没有吸过烟”，“persuade sb to do sth”是固定表达“说服某人做某事”；suggest，advise 语意不符，况且suggest没有这种用法。

[例8]We all think it most foolish______this mistake.

A.for you making　B.of you to make

C.you to make　D.for you to make

【解析】答案B。本题考查句型“It is+adj+of sb to do sth”意思为“某人做某事真是太……了”。本句话意思为：你犯这样的错误真是太愚蠢了。

[例9]Mrs.Smith warned her daughter______after drinking.

A.never to drive　B.to never drive

C.never driving　D.never drive

【解析】答案A。固定表达“warn sb to do sth”意为“警告/提醒某人做某事”，其修饰词never 应置于不定式符号to 之前。

[例10]Because of air pollution being greatly reduced，this city is still______.

A.a good place which to be lived in　B.a good place to live

C.a good place to live in　D.a good place to live for

【解析】答案C。动词不定式作名词的后置定语，同时介词in不能省略。