Question

________one of themost important inventions of the time, the computer helps people living indifferent countries to do a lot of things.

1. A.
   Knowing tobe
2. B.
   It wasknown
3. C.
   Known as
4. D.
   As wasknown to be

Answer 1

C
解析：
computer与know之间是动宾关系，状语用过去分词，表被动。译文：计算机被认为是这个时代最重要的发明，它帮助居住在不同国家的人们做了很多事情。