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一、高頻考點(diǎn)
1.主語從句
(1)what和that的選用
what和that都能夠引導(dǎo)名詞性從句，但是在名詞性從句中，that只能起連接作用，無詞義，不充當(dāng)句子成分，而what在名詞性從句中既起連接作用，又充當(dāng)主語、賓語或表語，意思是“所……的東西(事情)”。如：
What surprised me most was that such a little girl could play the violin so well.
(2)whether和if的選用
whether能引導(dǎo)主語從句，而if不能。
2.賓語從句
(1)what在賓語從句中有代替名詞的作用，在句中可作主語、賓語或表語;that只起引導(dǎo)作用，不作任何成分，可省略。如：
He seems different from what he used to be. (作表語)
(2)賓語從句中復(fù)合關(guān)系代詞whoever, whichever, whatever等有代替名詞的作用。如：
You may do whatever (anything that) you like.
3.同位語從句與定語從句的區(qū)別
(1)同位語從句與前面的名詞是同位關(guān)系，說明它前面名詞的內(nèi)容;屬于名詞性從句范疇。定語從句與前面的名詞是修飾與被修飾關(guān)系，限定前面名詞范圍，屬于形容詞性從句范疇。
The news that l have passed the exam is true.
The news that he told me just now is true.
(2)引導(dǎo)同位語從句的that是連詞，在從句中不充當(dāng)任何成份，而引導(dǎo)定語從句的that是關(guān)系代詞，除了起連接作用外，還在從句中充當(dāng)主語、賓語或表語等。如：
The idea that computers can recognize human voices surprises many people.
The idea that he gave surprises many people.
二、每日一練
1. _____ is known to us all is that the 2008 Olympic Games will take place in Beijing.
A. It B. What C. As D. Which
2. _____ I said at the meeting must be kept secret.
A. Whatever B. However C. Whichever D. Wherever
3. We are happy at the good news _____ Mr. Black has been awarded the Best Manager.
A. that B. which C. what D. whether
4. The bride and groom gave _____ attended their wedding some gifts to share their happiness.
A. whomever B. whoever C. whom D. who
【答案】BAAB
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