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This is     eraser and that is      pencil sharpener.
A.a;aB.an;aC.an;anD.a;an
B

试题分析:句意:这里有一个橡皮,那里有一个铅笔刀。不定冠词an用于元音音素开头的词前面,a用于辅音音素开头的词前面。eraser是以元音音素[?]开头的,pencil是以辅音音素[p]开头的。故选B。
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