这道题怎么做:________ is known to
________isknowntousallthattheoldscientist,for________lifewashardinthepast,stillworksv...
________ is known to us all that the old scientist, for ________ life was hard in the past, still works very hard in his eighties. [ ] A.It; whom B.As; whom C.As; whose D.What; whom
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