It has been increased by a factor of 4.为什么这句要使用现在完成时的“被动时态”?It has increased by three times as compared with that of 1998.而这句却是现在完成时的主动时态

it has been associated with an increase in error,which can be translated into an unsafe work environment.4596 There has been a great increase in retail sales.里 been表持续的意思吗?还有如 It's been a month. it has been associated with an increase in error, which can be translated into an unsafe work environment. 4596 什么意思?想知道：it has been associated with an increase in error怎么额翻译translate into 的3个基本意思。这里是转 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 there has been a sharp increase in automobile ownership中文什么意思 since 2007,the crime has been steadily on the increase in Andeby. 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... there has been great increase,后面那句怎么说?has nthere has been great increase,后面那句怎么说?has not there is not itis not there does there 考研图表作文模板 高手帮我修改下 it is obvious in the table that the rate of## has udnergone dramtic change,it has gone considerably in recent years.the## has been increasing dramtically sine##.it had a much sharper increase from## to # 英语翻译In the absence of a significant curvilinear regression,a linear increase of the ADG has been observed with the increase in the level of dietary copper supply there has been a big increase in prices.请问词句怎么是什么句型?另外,an increase in是固定结构嘛?希望有例句, drastic increase是什么意思~例如在这个句子中 there has been a drastic increase in the number of Chinese children suffering from kidney stones.