题目

Mom promised to buy me a nice gift for my next birthday, ________beyond my imagination. A. which                  B. that                     C. something            D. the one 答案：C一项工程甲单独做10天完成，乙单独做8天完成，先由甲做3天，再由甲乙合作，则再过多少天能完成这项工程34？