Tom is American boy. He plays basketball very well.A. a a B. an / C. / the D. an the

问题补充：

Tom is American boy. He plays basketball very well.

A. a, a

B. an, /

C. /, the

D. an, the

答案：

A. a, a

(答案→)B. an, /

C. /, the

D. an, the

解析：句意:汤姆是一个美国男孩.他篮球打得非常好.结合语境可知前文泛指任何一个美国男孩,故用不定冠词,American词首音素为元音，故不定冠词用an。Play在接球类运动时，不加冠词，故选B。