题目内容

They are still very cautious about ________ side effect the new medicine will bring about, although the experts have tried it on about 2000 patients.


  1. A.
    which
  2. B.
    that
  3. C.
    where
  4. D.
    what
D
考查名词性从句。What引导宾语从句,在从句中作宾语,故选D。
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