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It____ten years since his father died .A is Bwas Chad been Dwill be 为什么选a请具体一些

题目详情
It____ten years since his father died .A is Bwas Chad been Dwill be 为什么选a
请具体一些
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答案和解析
这是美国人为了简便创造出来的,这里的is相当于has been