He has a good knowledge of electricity, ________ helps him a lot in his work．


  1. A.
    that
  2. B.
    who
  3. C.
    when
  4. D.
    which
D
解析：
該題考查定語從句中關(guān)系詞的選用。此題沒有先行詞，整個主句“He has a good knowledge of electricity”是先行項，當(dāng)整個主句作為先行項時，關(guān)系代詞通常使用which，引導(dǎo)一個非限制性定語從句，which指的是整個主句。
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