黑鹰s 开放式:“what has been up to ?”什么意思？

“what has been up to ?”什么意思？ 翻译what measure has been taken to reduce car accidents? "what have u been up to?" 啥意思？ What have you been up to?什么意思？ has been to make has been to 的问题 what u been up too?什么意思 She has been added to your Favorites A problem has been detected and windows has been shut to prevent damage to your computer A problem has been detected and windows has been shutdown to prevent damage to computer.