解下列二元一次方程组:x+y=42x-y=-1.. 发布时间:2017-06-09 01:09 │ 来源:www.tikuol.com 题型:解答题 问题: 解下列二元一次方程组:x+y=42x-y=-1..
题型:解答题 —Have you ever been toShanghai, Mary? —Yes. I_______ there for three days with my parents last month.[ ]A. have gone B. have been C. went D. was 查看答案