_______ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties.
| A．It; whom | B．As; whom | C．As; whose | D．What; whom |
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_______ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties.
| A．It; whom | B．As; whom | C．As; whose | D．What; whom |
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