_____ORBIS doctor who got here yesterday needed _______ X-ray machine to
examine his patients.
A．The; aB．The; anC．An; aD．An; an
B
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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