单选题 This is one of the longest bridges that ______ on this river.
  • A) is ever built
  • B) has ever been built
  • C) was ever built
  • D) has ever built


【正确答案】 B
【答案解析】[解析] 本题测试的是动词时态和语态的用法。主句是一般现在时而且包含形容词的最高级，故其从句应选现在完成时。