问题
选择题
Lucy is a young woman with a_____son. [ ]
A. three year old
B. three-years old
C. three year olds
D. three-year-old
答案
答案：D
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Lucy is a young woman with a_____son. [ ]
A. three year old
B. three-years old
C. three year olds
D. three-year-old
答案：D