问题
选择题
David wants to be _____ engineer while Cathy wants to be _____ doctor. [ ]
A. an; the
B. the; the
C. an; a
D. the; a
答案
答案：C
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David wants to be _____ engineer while Cathy wants to be _____ doctor. [ ]
A. an; the
B. the; the
C. an; a
D. the; a
答案：C