A. It's pen
B. This is a pen
C. It's a pen
D. This is an pen
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◎ 解析
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◎ 知识点
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◎ 相似题
与“－What's this? －_____. [ ]A. It's pen B. This is a pen C. It's a pen D. This is an pen ”考查相似的试题有：
