English is useful language because people in many countries are using it.A. aB. anC. theD

问题补充：

English is useful language because people in many countries are using it.

A. a

B. an

C. the

D. /

答案：

(答案→)A. a

B. an

C. the

D. /

解析：句意：英语是一门有用的语言，因为在许多国家人们用它。表示类别该用不定冠词，useful虽以元音字母开头，但第一音素是辅音，所以选A。