单选题 Running slowly for (some) three miles every day (is proved) a good (form) of (exercise).
  • A. some
  • B. proves
  • C. form
  • D. exercise


【正确答案】 B
【答案解析】语态错误，应改：为proves。prove(to be)sth./adj./that...“被证明…”，本身包含被动的意思，所以通常不用be proved。