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原题是翻译题:直到他给我写信我才知道他已参军.Ididn'tknowhehadjoinedthearmyuntilhewrotetome.这样翻译有语法错误吗?该用didn'tknow还是有hadn'tknown?

题目详情
原题是翻译题:直到他给我写信我才知道他已参军.
I didn't know he had joined the army until he wrote to me.
这样翻译有语法错误吗?该用didn't know 还是有hadn't known?
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答案和解析
didn't know.因为这句话里面没有涉及到过去完成时.