Caffeine was a frequent ingredient in these concoctions, presumably because, in part at least, people had become accustomed to the stimulation that coffee and tea provided.
in part at least 在句中的成分?
在because 从句中,in part at least (至少在某种程度上)作“评注性状语”,修饰全句。表达说话人自己的看法。
有些习语(包括非谓语动词、副词、介词短语等)在句中可以独立存在,它们往往作为句子的独立成分来修饰全句,表明说话者的态度、观点等,我们称这种状语为评论性状语或评注性状语。
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插入语。