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It is           useful book. I borrowed it from           school library.
A.an ; aB.a ; an
C.an; theD.a ; the
D

试题分析:冠词是一种虚词,一般用于名词前面表示特指或者泛指某一个。冠词的应用都用一定规则,熟记这些规则是解题的关键。不定冠词用在名词前,表示泛指任何一个。定冠词用在名词前表示特指某一个。在专有名词及表示泛指的复数名词前一般不要冠词,叫做零冠词。需注意的是不定冠词的用法是看词首音素,不是看首字母,如:useful首字母是元音,但是词首音素时辅音,故不定冠词用a;hour首字母是辅音,但是词首音素是元音,故用冠词an。
句意:这是一本有用的书。我从学校图书馆借的。结合语境可知前一空泛指任何一本有用的书,useful词首音素是辅音,故不定冠词用a。后一空特指前文提到的这本书,故用定冠词。选D。
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