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【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(jiān)定地宣布他們找到了原因。announce“宣布”,動(dòng)詞,根據(jù)時(shí)間狀語After they had studied for years,可知主句的 時(shí)態(tài)是一般過去時(shí),故用announced。

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