问题
选择题
This is ________ key. That's ________ orange.[ ]
A. a, a
B. an, an
C. a, an
D. an, a
答案
答案：C
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This is ________ key. That's ________ orange.[ ]
A. a, a
B. an, an
C. a, an
D. an, a
答案：C