6. Doing your homework is a sure way to improve your test scores, and this is especially true _____ it comes to classroom tests.

　　A) when B) since C) before D) after

　　A A A

　　7. Americans eat _____ as they actually need every day. (98/06/56)

　　A) twice as much protein

　　B) twice protein as much

　　C) protein as much twice

　　D) protein as twice much

　　8. _____ seeing the damage he had done, the child felt ashamed. (99/01/52)

　　A) By B) On C) At D) For

　　9. I was advised to arrange for insurance _____ I needed medical treatment. (99/01/65)

　　A) nevertheless B) although

　　C) in case D) so that

　　A B C

　　10. I've already told you that I'm going to buy it, _____.

　　A) however much it costs

　　B) however does it costs much

　　C) how much does it cost

　　D) no matter how it costs

　　A

　　名词从句包括主语从句、宾语从句，其中有介词与形容词的宾语从句、表语从句和同位语从句。

　　名词从句

　　1 .主语从句在句子充当主语， 谓语动词用第三人称单数

　　Why he refused to work with you is still unclear now.

　　Whoever comes is welcome.

　　主语从句前的that不能省，仅起连接作用。通常由it作形式主语,that 从句后置。

　　That he became a lawyer may have been due to his mother’s influence.

　　It is not true that he has moved to New York.

　　2. 宾语从句,要用陈述句语序。

　　I don’t know where the sound came from.

　　Don’t be satisfied with what you have achieved.

　　Please tell me what is wrong/the matter with you, and I can help you.

　　由 that 引导的从句只能用在介词 but, besides, except, in, save, saving 之后。例如：

　　I know nothing about him except/but that he is Japanese.

　　He differs from his brother in that he is very selfish.

　　whether 与if 在名词从句中的用法区别(if一般只用于宾语从句)

　　1). 由whether引导的主语从句，表语从句不能由if来替换

　　Whether he will attend the meeting is uncertain.

　　The question is whether he will come.

　　2).宾语从句中, whether可以和or not直接连用.可以说whether or not而不说if or not。

　　I don’t care whether or not he will attend the meeting.

　　I don’t care if/whether he will attend the meeting or not.

　　3).whether可用在介词后，或用在带 to的不定式前，if则不可以。

　　Judy doesn't know whether to get married now or to wait.

　　I haven’t settled the question of whether I’ll go back home.

　　重要考点：出现if引导的从句时先判断是宾语从句还是条件状语从句。当if意为“是否”时，引导宾语从句，时态根据时间状语和主句谓语来定。当if意为“如果”时，引导条件状语从句，用一般时表将来。

　　I won’t go there if he _____ (come) here tomorrow.(条件状语从句)

　　I don’t know if he _______ (come) here tomorrow.(宾语从句)

　　comes

　　will come