亲, 这是两个结构。
1) widely accepted是常见的“副词+过去分词” 常用作定语,也可作表语。
如: This practice has been widely accepted. It is a widely accepted practice.
2) be accepted widely 是句中作谓语部分,这里叫“系表”结构。
be accepted widely, 状语放到动词后面,但如果这样单个副词作的状语,也可以放到前面,成了be widely accepted意思一样。
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