请教语法现象：be dated

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/06/11 18:49:46

请教语法现象：be dated
a requirement that a document be dated...
that 及其后的部分是什么语法现象?
是不定式做同位语或者其他?
that后算不算同位语从句？还是一个省to的不定式？be dated在此处是被动语态，还是做形容词用？

意思：一项规定,即文件注明日期...
只是一个不带to的不定式
be dated只是一个被动语态,是作谓语

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