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8．He should haveseized the chance to prove that he was innocent，but he didn't．

分析 他本應該抓住這次機會來證明自己的清白的，但是他沒有．

解答 答案：seized．
根據后面的句子but he didn't可知，他沒有證明自己的無辜，所以前面應該使用情態(tài)動詞should+have done表示本應該做某事而沒有做；故答案為seized．

點評 做完成句子注意解題步驟：1．分析每道題目需要完成部分的語法屬性　2．劃出已給出部分的中心詞．依據空格前后成分，確定空格的語法屬性：詞性、單復數、時態(tài)等．

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