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【題目】I have been to Beijing twice.(改為否定句)

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【答案】I haven’t been to Beijing twice.

【解析】

句意:我去過北京兩次。

考查否定句。本題要求更改為否定句。本句時態(tài)為現(xiàn)在完成時,構成否定句需要將not放在助動詞have后,故填I haven’t been to Beijing twice.

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