单选题 ______ I had time, I would have run round that lake again.
  • A. If
  • B. Unless
  • C. Had
  • D. When
【正确答案】 C
【答案解析】[解析] 此题考查的是虚拟语气的倒装形式，原句为“if I had had time, I would have run around that lake again”但将had提前倒装后，引导词if省略。