be agreed be agreed后为什么还要加upon呢?

be agreed be agreed后为什么还要加upon呢? be agreed 英语翻译Changes of XXXX(公司名字) requirement have to be agreed upon He’s agreed to our suggestion about the holiday.为什么是be agree We have agreed that a play will be a_____ 5.Our staff agreed that ______ stand must be unified. 为什么agree的过去式是agreed,而不是agreeed呢? 英文翻译：based upon the achievement of mutually agreed performan 英语翻译Once a week (fixed date/time to be agreed) lantao and lu 英语翻译It is hereby agreed that this contract shall be performe we agreed to rent the house on _ that the roof should be rep laycan is agreed to be 10th-15th January 2007怎么理解?