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It's five years ____I came to this town

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It's five years ____I came to this town
A since B when C before D until
答案是A
如果选A这里不应该用it has been 吗 还是’S 是省略什么呢
求解释
It's five years ____I came to this town
It's five years since___I came to this town等于it has been five years since i came to this town
再问: 你写的2句有什么不同?it is 等于 has been ?还是's 是 has ?
再答: It's five years =it is five years it's been five years=it has been five years it is 不等于 has been
再问: 谢谢你的回答 这个我也知道 但你的解释我不是很明白 这句话答案是It's five years since I came to this town 因为感觉since前面应该用have been 而此句用it is 又是为何呢
再答: 我说过这两句相等 没有区别 自从我来的这个城市,已经5年啦 两种表达都可以 这回明白了么