On AIDS Day President Hu Jintao demanded that the problems paid special attention to.A.

问题补充：

On AIDS Day, President Hu Jintao demanded that the 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：考查虚拟语气和分词作定语。referred to为后置定语修饰the problems, 又因为demand引导的宾语从句引用虚拟语气，故谓语动词应该是should be，而should可以省略，所以答案为B。