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【题目】他们相识许多年了。 (each other)

【答案】They have known each other for many years.
【解析】根据句意可知句子的时态要用现在完成时,have done, 主语是they, 谓语动词要用复数,相识:know each other, 许多年:many years, for+段时间和现在完成时连用,所以答案是They have known each other for many years.

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