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7.In our class,the student leaders are on ______ duty every ______ few days.(  )
A.the; aB.a; theC.a; aD.不填; 不填

分析 在我们班,班干们每隔几天就值日.

解答 答案:D
题干中on duty值日,固定短语;every few days每隔几天,不定冠词a不能与every,next,last等连用.故选D.

点评 冠词是一种虚词,本身不能独立使用,只能放在名词前帮助说明名词所指的人或事物,它是英语词性中最小的一类,只有三个,一种是不定冠词a,an;一种是定冠词the.此外也有些特定场合不用冠词,即通常所称的零冠词.不定冠词表示泛指,定冠词表示特指.

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