为啥it is some time since与it has been some time since没区别

为啥it is some time since与it has been some time since没区别 为啥it is some time since与it has been some time since没区别谢谢了, some time it is true,some time is not. it is some time before与it is some time since 的区别是什么,请举例说明, it is some time since+...与it has been some time since+...什么区别? _____?It's seven A How old is Ben B What time is it C How much si it _____?It's seven A How old is Ben B What time is it C How much si it Farce over,it is time to face Farce over,it is time to face some things It is time for some bread?(同义句） IS the library on the secod floor?是 where is the library?Is the library open now?what time si it?when is the library open?什么 意思？ It really took him:___ to draw the nice horse.　　A.sometimes B.hour C.long time D.some time选D为啥谢谢 is it some book? It is high time It is high time it is a time what time is it what time is it? it,is,what,time?