The library is said (burn) ______ down in a fire ten years ago.to have been burn

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问题 The library is said (burn) ______ down in a fire ten years ago.

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答案 to have been burned

解析不定式的完成式表示动作发生在主句谓语动词的动作之前，本句还表示被动。

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Thesilenceofthelibrary______onlybythesoundofpagesbeingturnedover.A、h