______ 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. Which; whose C. What; whom D. It; 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. Which; whose C. What; whom D. It; whose
C