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