_______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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