President Xi Jinping demanded that the environmental problems paid special attention to.A

问题补充：

President Xi Jinping demanded that the environmental problems paid special attention to.

A. referred to being

B. referred to be

C. refer to being

D. refer to be

答案：

A. referred to being

(答案→)B. referred to be

C. refer to being

D. refer to be

解析：

试题分析:考查非谓语动词。由语义可知refer to 和problem之间是被动关系，所以用过去分词做后置定语，而demand后面宾语从句的谓语动词应该用should +动词原形，所以答案选B。句意：习近平主席要求提到的环保问题应该给予特别关注。