GuanTianlang is 14-year-old boy but he is famous all over the world.A. aB. anC. theD. /

问题补充：

GuanTianlang is 14-year-old boy, but he is famous all over the world.

A. a

B. an

C. the

D. /

答案：

(答案→)A. a

B. an

C. the

D. /

解析：句意：关天朗是一个十四岁的男孩，但是他在全世界都很有名。结合语境可知本句中泛指任何一个十四岁的男孩，故用不定冠词。Fourteen词首音素是辅音，故不定冠词用a。选A。