问题描述：
He told us that he had worked here since 10years before.这个句子对么?
在此处since和before连用怎么讲?
since 10years before完全等于since 10 years ago么？
在此处since和before连用怎么讲?
since 10years before完全等于since 10 years ago么？
问题解答：
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