问题
选择题
This is _________ key and that is ________ eraser. [ ]
A. a, a
B. a, an
C. an, a
D. the, an
答案
答案：B
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This is _________ key and that is ________ eraser. [ ]
A. a, a
B. a, an
C. an, a
D. the, an
答案：B