问题
选择题
That isn't _____ ring. It's _____ eraser. [ ]
A. an ,an
B. a, a
C. an, a
D. a, an
答案
答案：D
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That isn't _____ ring. It's _____ eraser. [ ]
A. an ,an
B. a, a
C. an, a
D. a, an
答案：D