An ________ boy, Li Wen, works hard and gets good grades in his final exam.
| A． |
eighteen-year-olds |
B． |
eighteen-year-old |
C． |
eighteen years old |
An ________ boy, Li Wen, works hard and gets good grades in his final exam.
| A． |
eighteen-year-olds |
B． |
eighteen-year-old |
C． |
eighteen years old |
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