【单选题】A ______ school boy, Li Li da, first tried to swim across the Qiongzhou Channel in June, 2000.
A.12-year old
B.12-years-old
C.12 years old
【单选题】A ______ school boy, Li Li da, first tried to swim across the Qiongzhou Channel in June, 2000.
A.12-year old
B.12-years-old
C.12 years old
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