题目内容

Wang Gang is considering buying a computer,         is considered to be a great help in our work and study.
A．asB．whichC．thatD．what
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。
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