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--four years since I joined the army.A.There was B.There is C.It was D.It is选个为什么请分析C和D

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--four years since I joined the army.A.There was B.There is C.It was D.It is选个为什么请分析C和D
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答案和解析
选D,it is+time+since+V,固定搭配,意思是自从没做***已经多久了
选C是错吧它当作强调句,好像是的,不知道对不对哦