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It is fifty-four years since the People's Republic of China_

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It is fifty-four years since the People's Republic of China______
A.founded B.was founded C.has founded D.has been founded
答案应该是A,为什么?请说明原因,
found 建立,因为新中国建立的事实已经完成,所以过去式加ed 就可以了,排除C,D.
新中国成立是主动的,不能说新中国被成立,所以排除B