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 在我們班，班干們每隔幾天就值日．

解答 答案：D
題干中on duty值日，固定短語(yǔ)；every few days每隔幾天，不定冠詞a不能與every，next，last等連用．故選D．

點(diǎn)評(píng) 冠詞是一種虛詞，本身不能獨(dú)立使用，只能放在名詞前幫助說(shuō)明名詞所指的人或事物，它是英語(yǔ)詞性中最小的一類(lèi)，只有三個(gè)，一種是不定冠詞a，an；一種是定冠詞the．此外也有些特定場(chǎng)合不用冠詞，即通常所稱(chēng)的零冠詞．不定冠詞表示泛指，定冠詞表示特指．

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