问题
选择题
In the study of modern science, there are many cases _____ soldiers can teach officers．
A．when
B．who
C．which
D．where
答案
答案：D
考查定语从句。先行词为抽象的地点名词cases，且从句中不缺主语或宾语，缺少的是地点状语，所以用关系副词where,选D。
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