Beijing has got population of more than 13.8 million.A. theB. aC. anD. /

问题补充：

Beijing has got population of more than 13.8 million.

A. the

B. a

C. an

D. /

答案：

A. the

(答案→)B. a

C. an

D. /

解析：句意：北京有1380多万人口。population常与定冠词the连用,作主语用时,谓语动词常用第三人称单数形式，有时population可用作可数名词,其前可用不定冠词。故选B。