____four years since I joined the army.A.There was B.There is C.It is D.It was 请问选哪个?

____four years since I joined the army.A.There was B.There is C.It is D.It was 请问选哪个? my brother is going to study in japan ____four years为何用for请说明 求教一道英语单项选择题.____four years since I joined the Army.A、There wasB、There isC、It wasD、It it为什么不是C呢?joined the Army应该是过去才对.但是.难以理解,求教.D选项是it is，打错了。 I have lived in Beijing for four years.同义句子I have lived in Beijing ____four years_____. since ten years since ten years ago区别 It_______ten years since we last it's years since i 可以说since many years before ____the chair ____four legs? since years ago用于什么时态 SINCE TWO YEARS AGO的同义句 ten years _____(pass) since then. It three years since I smoked.翻译 It is five years since he smoked i have been skating since nine years since two years ago与since two years的区别,分别用在什么时态? He has collected stamps since ten years age 对since ten years age 提问用什么? I have known sandy since three years ago以 since three years ago ,提问