it has been demonstrated that 的意思?如：For example,it has been demonstrated that rapid response leads to a greater li kelihood of arrest only if responses are in the order of 1-2 minutes after a ca ll is received by the police.在这句话中i

it has been since.用法 It has been in my it is/has been= It's has been accepted it has long been assumed it's always been you(It has always been it has been可以缩写成it's been it's been.的全称是不是 it has been... It has been raining these days. It has been e()hot this week. it has long been known that it has since been rebuilt怎么翻译 造句it has been +时间段+since从句it has been +时间段+since从句 it has been used和it has been in use有什么区别吗 是It has been paid还是 It has been paid for? 为什么是It has been paid而不是 It has been paid for? It was 85 years还是 it has been 85 years? it has been done 谓语it has been done 这句话done作表语还是been done做谓语?