it is four years since I joined the army.这里的is,为什么不用was呢?

it is four years since I joined the army.这里的is,为什么不用was呢? It __four years since i joined the army.这里的is,为什么不用was呢? --four years since I joined the army.A.There was B.There is It is four years since I joined the army.啥意思 It is 3 years since he joined the army.为什么用is不用has been It is three years since he joined the army.为什么是用joined而不是用ha It is three years since I joined the army.改成完成时态 I 1.It is two years ＿I joined the army.A.before B.since C.that ____ four years since I joined the Army. 用since的话,本句应该是：It is ten years since he joined the army. It was three years ago that he joined the army与It is three y 看到一句It is 3 years since he joined the army.和一句It has been th