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【题目】They have already changed their plan. (改为否定句)

They______ changed their plan______.

【答案】haven’t yet

【解析】

句意:他们已经改变了他们的计划。

根据句意理解及句子结构分析可知,原句是现在完成时,所以变成否定句直接在have后面加not即可,havenot可以缩写成haven’t,而肯定句中的already在否定句中要改成yet,故答案为haven’tyet

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