2. 外语
  3. The police ran ______ all possible leads in the case.

The police ran ______ all possible leads in the case.

admin2010-03-19  21
问题 The police ran ______ all possible leads in the case.
选项 A、in
B、up
C、against
D、down
答案D
解析 此题考查动词词组搭配。run down意思是“追溯，追踪…的来源；用完，跑下，停止”，run in意思是“跑进，顺便探访，拘留”；run up意思是“向上跑，赶制，迅速积累”；run against意思是“撞上，偶遇，违反”。
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