This is key and that is eraser.A. a, aB. a, anC. an, aD. the, an

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A. a, a
(答案→)B. a, an
C. an, a
D. the, an
解析：此题考查不定冠词的基本用法。）不定冠词有a和an两种：a用于辅音音素开头的词前，an用于元音音素开头的词前。