单项填空；选择最佳*。—DoyouknowMary?—Yes,Maryis
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问题详情：
单项填空；选择最佳*。
— Do you know Mary?
—Yes, Mary is ______ girl, but she knows a lot about science.
A. a eight-year-old B. a eight-years-old
C. an eight years old D. an eight-year-old
【回答】
D
知识点：构词法
题型：选择题
