Who is boy playing basketball on the playground. He is Tom. He joined unusual basketball

问题补充：

Who is boy playing basketball on the playground.

He is Tom. He joined unusual basketball match last year.

A. an. a.

B. a. a.

C. the. a.

D. the. an.

答案：

A. an. a.

B. a. a.

(答案→)C. the. a.

D. the. an.

解析：句意：在操场上打篮球的男孩是谁？——他是汤姆。他去年参加了一次不同寻常的篮球比赛。结合语境可知上文特质正在操场上打篮球的男孩，故用定冠词the。下文泛指任何一个不寻常的比赛，故用不定冠词，unusual词首音素是辅音，故不定冠词用an，选C。