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    【题目】After they had studied for years, they a （宣布）with certainty that they found out the reason.

    【答案】announced
    【解析】句意：在研究了几年之后，他们坚定地宣布他们找到了原因。announce“宣布”，动词，根据时间状语After they had studied for years，可知主句的 时态是一般过去时，故用announced。

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