2. 外语
  3. According to the Department of Transportation, the additional street lights and road signs have led to______safety conditions on

According to the Department of Transportation, the additional street lights and road signs have led to______safety conditions on

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问题 According to the Department of Transportation, the additional street lights and road signs have led to______safety conditions on the highway.
选项 A、improve
B、improves
C、improvement
D、improved
答案D
解析 修饰名词safety conditions的应为形容词。因此和形容词一样在名词前或后对其起修饰作用的分词(D)improved(提高的)为正确答案。动词(A)和(B)不能修饰名词，(C)也不能出现在非复合名词前。作为参考，lead to(have led to)中的to为介词，其后应接名词而非动词原形。
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