题目内容

【题目】Mona went to Shanghai two days ago.(改为同义句)
Mona in Shanghai since two days ago．

【答案】has；been
【解析】①瞬间动词用于“一段时间 + ago ”的一般过去时的句型中；②瞬间动词可改成与之相对应的延续性动词或短语,与一段时间连用；③“since+时间点”做状语时，主句常用现在完成时。went属于瞬间动词，be属于延续性动词。现在完成时态的肯定句结构是：主语+助动词have/has+过去分词+其它。因为主语Mona是单三，所以助动词用has与主语保持数的一致。所以答案是：（1）has（2）been

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