题目内容
【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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