题目

—Did you find your lost key?—No, but I think ________ must have picked it up. A．nobody   B．somebody C．anybody   D．everybody 答案：B  李老师班级要买24本《中国故事》，精品书店每本按原价九折出售，三味书店每买5本赠送1本，不满5本不赠送，两个书店的《中国故事》每本标价都是10元，请你算一算：李老师到哪家书店购买比较便宜？最少要花多少钱？