____ 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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