题目

（·温州市八校高三月联考）    18. Carol said the work would be done by October, _________ personally I doubt very much. A. that          B. when             C. it               D. which 答案：D15．一根绳子如果3折量一口井，余出$\frac{4}{5}$米；如果4折量又不足$\frac{3}{10}$米．求绳长、井深各是多少米？