单选题 As early as 1637 Ohio made a decision that free, tax supported schools must be established in every town ______ 40 households or more.
  • A. having
  • B. to have
  • C. to have had
  • D. having had
【正确答案】 A
【答案解析】[解析] 根据句子结构，空格后的部分是修饰“ever town”，作定语讲，应选择分词“having”。