It’s six years since we knew each other同义句 we （） （） each oth

It's six years since we knew each other(改为同义句） 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? 1.it ____ 5 years since we knew each other.A is B had been C since we knew each We met each other three years ago.(改为同义句） _ three years _ we It's three years since we saw each other last time = We ____ We haven't seen each other for 2 years 改为同义句It's two years _ We met each other three years ago的同义句 （1）we haven`t seen each other for 10 years since we metlast. (it is ） four years since we last saw each other.这句话括号里为什么不是 We’ve been very close since we met each other 2 years ago.这句