单选题 ______ of the river has been polluted.
  • [A] Second-three
  • [B] Two-three
  • [C] Two-third
  • [D] Two-thirds


【正确答案】 D
【答案解析】考查分数的表达法。连字符前面是基数词，后面是序数词。如果基数词大于等于2，序数词要加s。