_____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.
A．As; whomB．What; whom C．It; whoseD．As; whose
B
本題考查連接代詞。_____is known to us all 是主語從句，排除AD,第一個(gè)空上的詞要做主語，第二個(gè)空上的詞做for的賓語，代替the old scientist。
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