Wang Gang is considering buying a computer,         is considered to be a great help in our work and study.
A．a(chǎn)sB．whichC．thatD．what
B
考查非限制性定語從句。先行詞是a computer，在從句中作主語，as正如，正像，不符合句意；that不能引導(dǎo)非限制性定語從句；what不能引導(dǎo)定從。所以選B。
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