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It is uncertain           side effect the medicine will bring about, although about two thousand patients have taken it.


  1. A.
    that
  2. B.
    what
  3. C.
    how
  4. D.
    whether
B
考查賓語從句。賓語從句中 bring about后缺少賓語,故用what 作定語修飾side effect,句意:還不清楚這種藥會帶來什么樣的副作用,雖然大約兩千名病人已經(jīng)服用過。故選B。
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