【題目】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：在研究了幾年之后，他們堅定地宣布他們找到了原因。announce“宣布”，動詞，根據(jù)時間狀語After they had studied for years，可知主句的 時態(tài)是一般過去時，故用announced。

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