【题目】Stephen Hawking, ________ “the greatest genius of the late 20th century”, announced that there are really grey holes in the universe.
A.calling
B.to call
C.to be called
D.called

【答案】D
【解析】句意：Stephen Hawking，被称为二十世纪晚期最伟大的天才，宣称在宇宙中真的有灰洞。过去分词作后置定语，故选D。