A. These are books
B. It's a book
C. They are pens
D. That aren't pens
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◎ 解析
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◎ 知识点
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◎ 相似题
与“—What is this? —______. [ ]A. These are books B. It's a book C. They are pens D. That aren't pens ”考查相似的试题有：
