as the Iron Lady, Thatcher passed away after suffering a stroke(中风)at the age of 87 on 8th April.
A. Know
B. Known
C. To know
D. Knowing
网友回答
A. Know
(答案→)B. Known
C. To know
D. Knowing
解析：考查过去分词做状语，逗号后面是完整的句子，前面应该是非谓语动词做状语，撒切尔和know之间是被动关系，用过去分词做状语，句意：以铁娘子著称，撒切尔夫人在4月8号87岁的时候，患中风去世。选B。