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 This is ______ eraser and that’s _____ ring . 
#34627
A
a ;a
B
an;a
C
a;an
D
an;an
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— Have you seen _____ empty box?— Do you mean _____ box you showed to me yesterday? I put it in your schoolbag.
#34175
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#33055
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#34465
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B
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_____Greens are preparing for the coming Thanksgiving Day.
#34120
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B
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C
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不定冠词(a,an)
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