the environment is important for human beings.
A. Take care of
B. Taking care of
C. Took care of
D. Take the care of
网友回答
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。