(单选题)

is known to us 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; whose

D.As; whose

参考答案：B

参考解析：

考查what引导的主语从句及介词+关系代词的用法。句意：我们大家都知道的是，那个老科学家过去的生活很艰难，现在80多岁仍然辛苦工作。前空为主语从句缺主语，as位于句首表示“正如”的含义，故排除A项、D项；后空先行词是“the old scientist”，用“介词+关系代词（宾格）”的形式引导定语从句，B项“whom”符合；whose意为“谁的”，不符合题意，排除C项。故选B。

知识点：

______ is known to us is that the old scientist, for ______ life was hard in the past, still works very hard in his eighties.

is known to us is that the old scientist, for life was hard in the past, still works very hard in his eighties.