Her sister is a nurse, so she always wears __________ uniform when she works.

A．a(chǎn)B．a(chǎn)n C．/D．these

A

解析試題分析：句意：他的姐姐是個護士，因此當她工作時，她總是穿著一套制服。結(jié)合語境可知本句中泛指任何一套制服，故用不定冠詞。Uniform詞首音素是元音，不不定冠詞用a。選A。
考點：冠詞
點評：冠詞是一種虛詞，一般用于名詞前面表示特指或者泛指某一個。冠詞的應(yīng)用都用一定規(guī)則，熟記這些規(guī)則是解題的關(guān)鍵。不定冠詞用在名詞前，表示泛指任何一個。定冠詞用在名詞前表示特指某一個。在專有名詞及表示泛指的復數(shù)名詞前一般不要冠詞，叫做零冠詞。需注意的是不定冠詞的用法是看詞首音素，不是看首字母，如：useful首字母是元音，但是詞首音素時輔音，故不定冠詞用a；hour首字母是輔音，但是詞首音素是元音，故用冠詞an。

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