how many years has it been since we last saw each other?

how many years has it been since we last saw each other? it's been six years since we last saw each other是个什么从句? ‘It's been six years since we last saw each other’怎么翻译? It's three years since we saw each other last time = We ____ It is three years ( ) we saw each other last year.括号中应填since It _(be)five years since we last saw each other. It has been a long time since we last wrote to each other. (it is ） four years since we last saw each other.这句话括号里为什么不是 一道初一英语连词成句many,it,is,they,years,since,other,time,saw,each,la It __ a long time since we last saw each other it is almost five years （）we saw each other last time It is almost five years ___ we saw each other last time.