单选题 The horse is getting old and can't run ______ it did.
  • [A] as faster as
  • [B] so fast than
  • [C] so faster as
  • [D] as fast as


【正确答案】 D
【答案解析】考查比较结构。as... as...引出的是同级比较，其中的形容词或副词不能用比较级形式，其否定式多用not so... as...。