问题
选择题
Tom is ______ boy . [ ]
A. a 18-year-old
B. an 18 years old
C. a 18 years old
D. an 18-year-old
答案
答案：D
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Tom is ______ boy . [ ]
A. a 18-year-old
B. an 18 years old
C. a 18 years old
D. an 18-year-old
答案：D