问题
选择题
It is _____ bird, not _____ airplane. [ ]
A. a, a
B. a, an
C. an, an
D. an, a
答案
答案：B
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It is _____ bird, not _____ airplane. [ ]
A. a, a
B. a, an
C. an, an
D. an, a
答案：B