專八改錯(cuò)練習(xí)第二十八篇：

For over 900 years, the Tower of London has served as aloyal __1__
palace and fortress. Today, it's famous for its bloody history and
for being the place where the Crown Jewels are kept.But it hasserved
for other purposes, too. It has been the royal arsenal, royalmint, __2__
royal observatory or even the royal zoo. The site of the Towerwas __3__
originally part of the Roman city of Londinium.
But, in 1066, a foreigner from north west France became King William __4__
of Britain, he ordered that a wooden castle built on the banks of __5__
the river Thames. The purpose of this fortress was to help secure
London, the most important city in his view realm. Ten years later,
William had the fortress rebuild in stone, and created a great __6__
fortified palace with walls three metre thick. Today, this building __7__
is known as the White Tower, and it stands in the centre of a much
larger stone fortress, which was built during later centuries. The
Tower now covers the area of seven hectares, and it stands near the __8__
busy financial district of the capital. But, once inside the high stone
walls, it's easy to forget the modern world outside and to take a
trip back through history. To help visitors explore, there are special
ceremonial guards, called Yeoman Warders. They are also known as
Beefeaters, and they are the best resource of information about the __9__
Tower's history. Nearly 40 Yeoman live and work in the Tower.
They are former soldiers who earned the privilege of serving as __10__
Yeoman after long service.

答案及解析(反白可見):
--royal
loyal和royal兩個(gè)詞形似容易混淆，前者是“忠實(shí)的”，后者是“皇家的，王室的”。
--/
serve the purpose 的意思是“適用，有……的用途”，不需要介詞for。如：
I don't really think that this piece of furniture serves any useful purpose.
--and
the royal zoo 和前面的the royal arsenal, royal mint, royal observatory都是并列項(xiàng)，所以在最后一項(xiàng)之前應(yīng)該用and。
4.But^--when;^a--when
原句其實(shí)有兩個(gè)分句， a foreigner from north west France became King William of Britain 和 heordered that a wooden castle built on the banks of the river Thames,兩個(gè)分句之間缺少了連詞連接。根據(jù)邏輯關(guān)系，這里應(yīng)該用表示時(shí)間的連接詞 when。
5.^built--be
動(dòng)詞order后面的that從句可以是be型虛擬語(yǔ)氣，也可以是情態(tài)助動(dòng)詞should。所以可以說(shuō)orderthat a castle should be built或者order that a castle be bulit。在后一種表達(dá)中，表被動(dòng)的助動(dòng)詞be不能省略。
d--rebuilt
這里出現(xiàn)的詞組應(yīng)該是have something done，意思是要求別人做某事。
--metres
當(dāng)數(shù)詞和度量名詞之間沒有連詞符時(shí)，名詞應(yīng)該用復(fù)數(shù)形式。
（area）--an
an area of seven hectares這是一個(gè)同位語(yǔ)詞組，area前應(yīng)該用不定冠詞。
ce--source
resource是“資源”，source是“來(lái)源”，所以應(yīng)該說(shuō) a source of information, a source of illness, asource of knowledge等。
^--have
顯然earned the privilege of serving as Yeoman這個(gè)動(dòng)作的結(jié)果是延續(xù)到現(xiàn)在的，應(yīng)該用現(xiàn)在完成體。?