问题
选择题
This is ____ eraser, and that is ____ ruler.[ ]
A. a; an
B. an; a
C. a; the
D. a; a
答案
答案：B
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This is ____ eraser, and that is ____ ruler.[ ]
A. a; an
B. an; a
C. a; the
D. a; a
答案：B