问题
选择题
_____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
答案：B
此题考查冠词的用法，the是定冠词，表示特指；a/an是不定冠词，表示泛指。a用在辅音音素开头的单词之前，an 用在元音音素开头的单词之前。