题目

写出数量间的相等关系式．一桶油，用去了它的 ，用去了20千克．问这桶油的重量？ 答案：解：根据分数乘法的意义可知，关系式为：一桶油× 34 =20千克His father invited his friend ________ with them. A. have dinner B. to have dinner C. has dinner D. to have to dinner