it ishas been+一段时间+since+句子（句子中用一般过去时）
这是完成时态里since所构成的一个最著名的结构.
意思是：自从.已经多长时间了.
所以D选项是it is或it has been.
能帮到你吧!
求教一道英语单项选择题.____four years since I joined the Army.A、There w
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