This has not been easy because i own over a thousand books.这句话中been是什么用法

she has not been around this week This transaction has not been submitted this has not been easy.中has not been什么意思?怎么来的?具体点 audio in this system has not been enabled什么意思 qui cktime has not been detected on this machine. This has not been easy 和 this is not easy 不是一个意思吗 This account has been blocked. this file has been damage This IP has been banned Not been before, has been lost.是什么意思 this Appie ID has not yet been used with the itunes Store. It is worth reminding ourselves that this has not always been the case in America To our __(surprise),the__(important) of this problem has not been known jack has not been to this baber's shop before中文翻译 This Apple ID has not yet been used in the itunes Store codeblocks 提示is seems this project has not been built yet any transaction pursuant to this agreement that has not been completed prior to QuicktTime has NOT been detected on this machine.Import capabilities are disabled