Susan is American girl. She plays piano very well.A. a theB. a /C. an theD. an /

问题补充：

Susan is American girl. She plays piano very well.

A. a, the

B. a, /

C. an, the

D. an, /

答案：

A. a, the

B. a, /

(答案→)C. an, the

D. an, /

解析：句意：苏珊是一个美国女孩。她钢琴弹得非常好。结合语境可知前文泛指任何一个美国女孩，American词首音素是元音，故不定冠词用an。Play表示演奏某种乐器时，一般要加定冠词the，故选C。