considered是对的。
这是“名词+过去分词”结构,称作“独立主格结构”,做时间状语,其语法功能相当于一个时间状语从句After all things have been considered.
不能直接填have been considered,因为这样前后两部分成了两个完整的句子,而中间是逗号,不是句号,且没有连词连接。这在英语里面是不允许的。下列句子均为正确表达:
All things considered,I think I 'd better take your advice.=All things have been considered。I think I 'd better take your advice.=After all things have been considered,I think I 'd better take your advice.
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