All the universities have a duty to keep their students ________ of the quick development of the scientific world.
A．informing B．to inform
C．informed D．being informed
All the universities have a duty to keep their students ________ of the quick development of the scientific world.
A．informing B．to inform
C．informed D．being informed
解析：句意：所有大学都有责任让学生了解科学界的快速发展。此处用了keep＋宾语＋宾补的句式，宾语their students 与动词inform之间为动宾关系，故用过去分词形式。 keep sb. informed of “使某人随时了解……”。
答案：C