单选题 You should know better than ______ your little sister at home by herself.
  • [A] to leave
  • [B] leaving
  • [C] to have left
  • [D] left


【正确答案】 A
【答案解析】[解析] 此题考查固定用法。to know better than to do sth.是一个常见的表示责备的句型，意为“应该知道不该做某事”。