名词性从句
1． After working on the maths problem for hours，he found________ he thought was the key to it.
A．what B．that
C．where
D．which
解析：what引导的名词性从句作found的宾语从句的主语，而且what在宾语从句中作主语。he thought 为插入语。
答案：A
2．Sometimes advertisements make ________ possible for companies to sell the customers ________ money can not buy.
A．/；that
B．it；what
C．that；which
D．itwhose
解析：句意为：有时广告让公司把用钱买不到的东西卖给顾客变得可能。it是形式宾语，真正的宾语是不定式短语。what 引导的是宾语从句，并在宾语从句中作宾语。
答案：B
3．So quickly are science and technology advancing ________ is a possibility today may be a reality tomorrow.
A．which
B．what
C．that which D．that what
解析：句意：科技发展如此迅速以至于今天的可能也许会成为明天的现实。本句是“so ...that ...”句型，表示“如此……以至于……”，结果状语从句中又包含了一个主语从句，what在该主语从句中作主语。
答案：D
4She is very dear to us.We have been prepared to do________ it takes to save her life.
A．whichever
B．however
Cwhatever
D．whoever
whatever 既作take的宾语，也引导do后的宾语从句。
答案：C
5．________ is known to us all is that the Chinese government has spared no efforts to protect people from fake food.
A．As
B．It
C．That
D．What
解析：分析句子结构可知，该题应用what引导主语从句，并在从句中作主语。that引导名词性从句时无意义也不作成分；如果用as构成定语从句，则应表达为As is known to us all the Chinese ...；如果用形式主语it，则表达为It is known to us all that the Chinese ...。
答案：D
6Faced with trouble or difficulty，a person takes ________ help that is available.
A．whatever
B．whenever
Cwherever
D．however
whatever 在此修饰help，意为“无论什么”，而其他三个选项，不作形容词，不能修饰名词，故排除。
答案：A
7．The fact has worried many scientists________ the earth is becoming warmer and warmer these years.
A．what
B．which
Cthat
D．though
“the earth is becoming warmer and warmer these years”不缺少成分，因此选C项。that引导的从句作fact的同位语。
答案：C
8．—Do you know her?
—No.Her name rings a bell but I can't remember ________ I read it before.
A．where
B．what
Cthat
D．if
A、B、C三个选项中只有where 可在宾语从句中作地点状语，if不符合语意。
答案：A
9．You should explore your talents so as to find out ________ your real interests lie.
A．what
B．which
C．where
D．how
解析：考查名词性从句。此处是由where引导的宾语从句，作find out的宾语同时在从句中作地点状语。所以答案选C项。
答案：C
10The media today can draw public attention to ________ help is actually needed.
A．that
B．which
Cwhere
D．whose
where引导宾语从句并且在宾语从句中作地点状语。
答案：C
11．Although I like cars, I don't want to buy one. My reason is ________ the price of oil keeps rising all the time.
A．because
B．that
Cwhy
D．how
reason时，表语从句常用that引导，不用because。语意“尽管我喜欢车，但我不想买。我的理由是油价一直在上涨”。
答案：B
12．—I was late this morning.
—Is that ________ your alarm clock failed to go off again?
A．why
B．how
Cbecause
D．when
because 用来陈述原因，why后面跟结果。
答案：C
13．The value of life lies not in ________ many days we live, but in ________ use we make of them.
A．that；which
B．whatthat
C．how；what
D．whathow
解析：考查介词后的宾语从句。第一空因为后面有many，要用how修饰；第二空后有use，是make use of中将use提前，所以要用what修饰。语意：生命的价值不在于能活多少天，而在于我们如何使用这些日子。
答案：C
14．I had little doubt ________ the worldwide antismoking campaigns will make more and more people be aware of the danger of smoking.
A．whether
B．that
Csince
D．if
little doubt表示“不怀疑”，要用that来引导同位语从句。而whether，if均表示“是否”，可排除。
答案：B
15．All things considered, I think we ought to give the job ________ we believe has a strong sense of duty.
A．whoever
B．whomever
Cwho
D．those
we believe为插入语，宾语从句中缺少主语，故用whoever，表示“无论谁”。
答案：A