问题
选择题
My ____ son will go to kindergarten (幼儿园) this September.[ ]
A. four year old
B. four-years-old
C. four years' old
D. four-year-old
答案
答案：D
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My ____ son will go to kindergarten (幼儿园) this September.[ ]
A. four year old
B. four-years-old
C. four years' old
D. four-year-old
答案：D