In the study of modern science, there are many cases _____ soldiers can teach officers．
A．whenB．whoC．whichD．where
D
考查定語從句。先行詞為抽象的地點(diǎn)名詞cases，且從句中不缺主語或賓語，缺少的是地點(diǎn)狀語，所以用關(guān)系副詞where,選D。
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