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【题目】①He not ( post) the letter yet .②He not ( post)the letter an hour ago .

【答案】has;posted;did;post
【解析】①句意:他还没有寄信。yet是现在完成时的标志,其结构为have/has+过去分词,主语是he,用has,所以答案是has posted。
②句意:他一个小时前没有寄信。ago是一般过去时的标志,此处是否定句,含有实意动词post,否定借助助动词did,后接动词原形,所以答案是did;post。

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