题目

With nothing _______ to burn, the fire became weak and finally died out. A . leaving B . left C . leave D . to leave 答案：B扬州历史上曾经有很长一段时期是我国商业贸易最繁荣的城市，后来逐渐萧条的原因是A. 水源供应不足 B. 战争迫使人口迁移C. 政治中心的转移 D. 交通条件变化