The overseas Chinese scientist made another wonderful discovery, ______ of great value to study AIDS.


  1. A.
    which I think it is
  2. B.
    which I think is
  3. C.
    I think it is
  4. D.
    I think is
B
考查定語從句:先行詞是discovery,定語從句中I think是插入語,定語從句中which做主語,it是多余的,句意:海外的中國(guó)科學(xué)家做出另一項(xiàng)重大發(fā)現(xiàn),我認(rèn)為這對(duì)研究艾滋病很有價(jià)值。選B。
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