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_____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.

A.     As; whom  B. What; whom   C. It; whose  D. As; whose

_____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.

A.     As; whom  B. What; whom   C. It; whose  D. As; whose

_____ is known to us all is that the old scientist, for _____ life was hard in the past, still works very hard in his eighties.

A. As; whom          B. What; whom             C. It; whose                  D. As; whose

_____ is known to us all is that the old scientist, for _____ life was hard in the past, still works very hard in his eighties.

A. As; whom               B. What; whom                 C. It; whose                        D. As; whose

 _____ is known to us all is that the old scientist, for_____ life was hard in the past, still works very hard in his eighties.

A. As; whom　　B. What; whom　　

C. It; whose　　 D. As; whose