问题
选择题
—Is it _____ egg?
—No, it isn't. It's _____ apple. [ ]
A. a, a
B. an; a
C. a, an
D. an; an
答案
答案：D
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—Is it _____ egg?
—No, it isn't. It's _____ apple. [ ]
A. a, a
B. an; a
C. a, an
D. an; an
答案：D