the environment is important for human beings.A. Take care ofB. Taking care ofC. Took car

问题补充：

the environment is important for human beings.

A. Take care of

B. Taking care of

C. Took care of

D. Take the care of

答案：

A. Take care of

(答案→)B. Taking care of

C. Took care of

D. Take the care of

解析：考查动名词短语作主语，分析句子成分，这里需要填动名词做主语，谓语动词用单数形式。句意：保护环境对人类是很重要的。选B。