1 as opposed to分开理解的话,as 连词 opposed是过去分词 这是带连词的过去分词 短语 作状语 与句子主语 是主表关系 相当于 一个状语从句 = as they are opposed to...
to xxx是过去分词的状语
2 to 后面是ing形式 即动名词 作介词宾语 因为这里to 是介词 .be opposed to doing sth反对做某事
3 分词短语作状语 应该有逗号.
英语语法：scientists have examined the benefits of a ...
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