number of people who use English as second language is increasing in China.A. A; aB. A;

问题补充：

number of people who use English as second language is increasing in China.

A. A; a

B. A; the

C. The; a

D. The; the

答案：

A. A; a

B. A; the

(答案→)C. The; a

D. The; the

解析：考查冠词用法。第一空是固定词组the number of…的数量；另外一个短语a number of许多，大量；第二空的结构为：“a/an 序数词”再，又；句意：使用英语作为又一门外语的人的数量在中国正在增加。故C正确。