问题
选择题
Wang Gang is considering buying a computer, is considered to be a great help in our work and study.
A．as
B．which
C．that
D．what
答案
答案：B
考查非限制性定语从句。先行词是a computer，在从句中作主语，as正如，正像，不符合句意；that不能引导非限制性定语从句；what不能引导定从。所以选B。