_________ 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.As; whose D.What; 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.As; whose D.What; whose