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【题目】I have been to Beijing twice.(改为否定句)

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【答案】I haven’t been to Beijing twice.

【解析】

句意:我去过北京两次。

考查否定句。本题要求更改为否定句。本句时态为现在完成时,构成否定句需要将not放在助动词have后,故填I haven’t been to Beijing twice.

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