题目内容
This is ________ eraser and that is ________ pencil sharpener.
[ ]
A.a; a
B.an; a
C.an; an
D.a; an
答案:B
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题目内容
This is ________ eraser and that is ________ pencil sharpener.
A.a; a
B.an; a
C.an; an
D.a; an