最后的歌小说:Although the rich man knew very clearly that the wine and food must be eaten by the servant

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Although the rich man knew very clearly that the wine and food must be eaten by the servant

1:::::::句子中that有什么用
2:::::::为什么要用be
能详细解释一下 被的关系BE的部分吗 不是很懂

that 此处引导的是宾语从句,表内容。
因为食物和酒是被吃,被喝,与人是被动关系,所以用be

that 此处是宾语从句的先行词,在从句中不做成分.
因为是被动关系,所以谓语动词前要加系动词.表被动