【题目】________ as the “the Father of Hybrid Rice”, Yuan Longping is a world-famous agricultural scientist.
A.Knowing
B.Having known
C.Known
D.To be known

【答案】C
【解析】be known as意为“被称为……”。Yuan Longping与know之间为被动关系，应用过去分词形式作状语。A、B项表主动，应排除；D项表将来，也可排除。故选C。句意：袁隆平被誉为“杂交水稻之父”，他是一位闻名世界的农业科学家。