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-How long does it take us to go to your school from here?
-It takes us        hour or more to go to my school by         bus.
A.an; aB.a, anC.an, /D.a, /
C

试题分析:句意:从你们学校到这儿,我们要用多久?——乘公交车到我的学校,我们要用一个小时或者多点。结合语境可知前一空泛指任何一个小时,故用不定冠词。Hour词首音素是元音,故不定冠词用an。下文by在表示交通方式时,后面直接接交通工具,不加冠词。故选C。
点评: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。
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