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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 usedD．to be using

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

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