Since Roman times,ostrich have been said to be so stupid that they react to danger by···have been done 是完成时态的被动语态?that引导什么从句?为什么用that

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Since Roman times,ostrich have been said to be so stupid that they react to danger by···
have been done 是完成时态的被动语态?that引导什么从句?为什么用that

这是一个so...that 句型.那么的...以至于
翻译就是:自从罗马时代,鸵鸟就被说成是如此的傻,以至于它们面对危险的反应是(把脑袋藏进沙子里).

so...that..如此以至于,目的状语从句

被动语态 被说笨
so.....that 结果状语从句