单选题 The installments of new traffic signals on Devonshire Street has been only ______ successful in lowering traffic congestion.
  • A. permanently
  • B. specifically
  • C. evenly
  • D. moderately
【正确答案】 D
【答案解析】[解析] 词汇：副词 1．这是一道词汇题，选项均为副词。 2．successful前可出现的副词是D选项moderately。 3．成功按照程度可分为：extremely(极其地)、moderately(适度地)、somewhat(多少)。因此中等程度的成功应选择moderately successful。