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In order to enter the PE exam, now we spend at _____ least half _____hour a day at school.
A.a; anB.the ; aC.不填;anD.不填; a
C

试题分析:句意:为了通过体育考试,现在我们在学校一天最少花费半个小时的时间。前文为短语at least最好,至少。下文泛指任何一个小时,故用不定冠词,hour词首音素是元音,故用不定冠词an,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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