He says that he _____ here for five minu 发布时间:2017-06-07 20:46 │ 来源:www.tikuol.com 题型:选择题 问题: He says that he _____ here for five minutes.A. has comeB. has arrivedC. has been D. came
题型:选择题 设映射f:x→-x2+2x是集合A=R到集合B=R的映射,若对于实数p∈B,在A中不存在对应的元素,则实数p的取值范围i是[ ]A(-∞,1)B.(1,+∞)C.[1,+∞)D.(-∞,1] 查看答案