Itisimpossibleforanyone_____these

发布时间：2020-07-26 05:28:27

It is impossible for anyone _____ these photographs before, because Mr Newman had them developed today.A.having seenB.to have seenC.to seeD.seeing

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B解析it是形式主语，不定式作真正的主语；由before可知要用不定式的完成式。
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