Maryis    girl,butsheknowsalotaboutscience.    A.aeight...

问题详情：

Mary is     girl, but she knows a lot about science.

     A. a eight-year-old   B. eight-year-old   C. eight years old    D. an eight-year-old

【回答】

D

知识点：构词法

题型：选择题