__is known to us all is that the old scientist, for___life was hard in the past,still works very
__isknowntousallisthattheoldscientist,for___lifewashardinthepast,stillworksveryhardin...
__is known to us all is that the old scientist, for___life was hard in the past,still works very hard in the past, still works very hard in his eighties.
A. It; whose B. As, whom C What , whom D. as ;whose 展开
A. It; whose B. As, whom C What , whom D. as ;whose 展开
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