Do you know how to learn English well as second language? A. aB. anC. theD. /

问题补充：

Do you know how to learn English well as second language?

A. a

B. an

C. the

D. /

答案：

A. a

B. an

C. the

D. /

解析：句意：你知道如何学好第二语言英语吗？a second language泛指除母语以外的另一种语言，the second language特指两种语言当中的另一种，所以选A。