Lucy is good girl. She often helps others.A. aB. anC. theD. /

问题补充：

Lucy is good girl. She often helps others.

A. a

B. an

C. the

D. /

答案：

(答案→)A. a

B. an

C. the

D. /

解析：表示事物类别用不定冠词，辅音因素用a，元音因素用an，本题good第一个音为辅音，故本题选A。