which在這里是引導非限定性定語從句，which引導非限定性定語從句有2個特點：

　　1. which前面有逗號與其他句子分開。 2. which指的是前面整句話的內(nèi)容。

　　as也可以引導非限定性定語從句，指的都是一句話的內(nèi)容。

　　which指一句話的內(nèi)容只能置于該句之后，而as既可以在后也可以在前。

　　67. _C_ is known to the world, Mark Twain is great American writer.

　　A That B Which C As D It

　　60. In the advanced course students must take performance tests at monthly _B_.

　　A gaps B intervals C length D distance

　　interval n. 間隔(即可指空間間隔，也可指時間間隔)，四級考試中�？紩r間間隔的概念。

　　interval是固定與介詞at搭配的。

　　23. Students or teachers can participate in excursions to lovely beaches around the island at regular _D_.

　　A gaps B rate C length D intervals

　　at regular rate 以規(guī)則的速度; at regular interval 以規(guī)則的時間間隔;

　　61. Mr. Johnson preferred _A_ heavier work to do.

　　A to be given B to be giving C to have given D having given

　　64. Our company decided to _D_ the contract because a number of the conditions in it had not been met.

　　A destroy B resist C assume D cancel

　　65. She is _C_ a musician than her brother.

　　A much of B much as C more of D more as

　　be of 具有某種性質(zhì)、品質(zhì)或特點;

　　66. Having been found guilty, the man was given a severe _B_ by the judge.

　　A service B sentence C crime D crisis

　　sentence n. 判決，判刑; crisis n. 危機; economic crisis 經(jīng)濟危機;

　　68. The residents, _C_ had been damaged by the flood, were given help by the Red Cross.

　　A all their homes B all whose homes C all of whose homes D all of their homes

　　當給出了句子的主語，且后面有兩部分謂語動詞，這兩部分謂語動詞之間又沒有連接詞，

　　時態(tài)也不同時，離主語近的謂語動詞應為從句的組合成分。

　　69. You can't afford to let the situation get worse. You must take _D_ to put it right.

　　A decisions B directions C sides D steps

　　take steps 采取措施，采取行動; take measures 采取措施;

　　70. Look at the terrible situation I am in! If only I _B_ your advice.

　　A follow B had followed C would follow D have followed

　　if only 如果，要是...就好了，其后面的句子一定要用虛擬語氣。

　　1. 如果if only后面的句子表示與現(xiàn)在或將來的事實相反，這時謂語動詞用一般過去時體現(xiàn)虛擬語氣。

　　2. 如果if only后面的句子表示與過去的事實相反，這時謂語動詞用過去完成時體現(xiàn)虛擬語氣。

　　47. If only the committee _D_ the regulations and put them into effect as soon as possible

　　A approve B will approve C can approve D would approve

　　如果if only后面的句子表示與現(xiàn)在或將來的事實相反，這時謂語動詞用一般過去時，

　　也可以用would + 動詞原形。

　　相關鏈接：新東方：四十天突破英語四級詞匯筆記(第2課)

　　　　　　　大學英語四六級考試選詞填空4招必殺技

　　　　　　　新東方：大學英語四六級單詞記憶方法大全

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