The population of the world still now.A. will; growBhas; grownC. is; growingD. is; grow

问题补充：

The population of the world still now.

A. will; grow

Bhas; grown

C. is; growing

D. is; grown

答案：

A. will; grow

B. has; grown

(答案→)C. is; growing

D. is; grown

解析：现在进行时态的用法。句意“现在世界的人口数量还在不断增长”，因此选C。