问题
选择题
Dr Ma, ________ ORBIS doctor, has done so important ________ job that many people are grateful to him. [ ]
A. a; a
B. a; an
C. an; a
D. an; an
答案
答案：C
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Dr Ma, ________ ORBIS doctor, has done so important ________ job that many people are grateful to him. [ ]
A. a; a
B. a; an
C. an; a
D. an; an
答案：C