A school boy LiLida first tried to swim across the Qiongzhou Channel in June 2000. A.

问题补充：

A school boy, LiLida, first tried to swim across the Qiongzhou Channel in June, 2000.

A. 12 - year old

B. 12 - years - old

C. 12 - year- old

D. 12 years old

答案：

A. 12 - year old

B. 12 - years - old

(答案→)C. 12 - year- old

D. 12 years old

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