As the twentieth century came to a close, the raw materials for a great national literature were at hand, waiting .
A. to use
B. to be used
C. to have used
D. to be using
网友回答
A. to use
(答案→)B. to be used
C. to have used
D. to be using
解析：由于the raw materials与动词use之间为被动关系，故用不定式的被动式。