_____ORBIS doctor who got here yesterday needed _______ X-ray machine to

examine his patients.

A. The; a           B. The; an          C. An; a            D. An; an

 

【答案】

B

【解析】此題考查冠詞的用法，the是定冠詞，表示特指；a/an是不定冠詞，表示泛指。a用在輔音音素開頭的單詞之前，an 用在元音音素開頭的單詞之前。    

 

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