你干什么去了！怎么翻译

what did you do ?

what were you doing？

what did you do？

楼上都是正解，不过要不要比较地道点的说法？What have you been up to.这个说法也是“你干什么去了”的意思，比较高级一点。当然楼上两位说的也是对的

what was u doing？

What were you up to?