题文
It is known to us all that the old professor, for______ life was hard in the past, still works hard in his seventies..
| A．whose | B．whom |
| C．what | D．which |
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It is known to us all that the old professor, for______ life was hard in the past, still works hard in his seventies..
| A．whose | B．whom |
| C．what | D．which |
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