已知全集U={0,1,2,3,4},集合A={1,2,3},B={2,4},则( 发布时间:2017-04-02 18:17 │ 来源:www.tikuol.com 题型:选择题 问题: 已知全集U={0,1,2,3,4},集合A={1,2,3},B={2,4},则(∁UA)∪B为( )A.{1,2,4}B.{2,3,4}C.{0,2,4}D.{0,2,3,4}
题型:选择题 —Why didn't you go to play football with us yesterday afternoon? —I _______ my mother with the housework then.[ ]A. helped B. was helping C. had helped D. have been helping 查看答案