请问It is six years since I last met you 与 It has been six years since I last met you 有什么区别

请问It is six years since I last met you 与 It has been six years since I last met you 有什么区别 Mary is six years old(对six years old提问 It ___ six years since I left school.空格填什么?It ___ six years since I left school.能填is,那has been 能不能填啊? the total ages of two boys is seventeen.what will it be in six years' time? The total ages of tow boys is seventeen.what will it be six years later 回答 What will it be six years 改写句子 I have learned English for six years.It is six years ___ I___ to learn English.(两空） 改为同义句（英语）I have learned English for six years.(改为同义句)It is six years ( ) I ( )to learn English. It is six fifteen是什么意思? 1.Which is true?答案是C为什么不选D呢?A.There are six years since I began studying EnglishB.It was six years since I began studying EnglishC.It is six years since I began studying English D.I have been six years since I began studying English The taotal ages of two boys is seventeen.What will it be six years later?什么意思？ Ann's brother is only six years old中对only six years old进行提问 ( )is it now?-It'six thiry 请问是six-year-old还是six years old还是six-years-old?(这个空签名有个a ) 英语翻译It is believed that china has teaplants as early as five to six thousand years ago ,and human development of teaplants dates back two thousand years. 请问What are seven eng six ----Is it thireen.哪错了, his younger brother ,who is ---- ,is in grade oneA six-year-old B six years old C six-year-young D six years young It weights six tons.= __ __ is six tons.= It's six tons ____.