In the study of modern science, there are many cases _____ soldiers can teach officers.


  1. A.
    when
  2. B.
    who
  3. C.
    which
  4. D.
    where
D
考查定語從句。先行詞為抽象的地點名詞cases,且從句中不缺主語或賓語,缺少的是地點狀語,所以用關系副詞where,選D。
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