The study compared data from 1985 to 2004 and found which the mean number of people with whom Americans can discuss matters important to them dropped by nearly one-third.
with whom …to them 做什么成分?
The study compared data from 1985 to 2004 and found which the mean number of people with whom Americans can discuss matters important to them dropped by nearly one-third.
句子红色的which为错误,应改为that(引导宾语从句)。
划线部分为定语从句,修饰people。whom指代people。with whom介词短语在从句中作状语,修饰谓语动词discuss。
to them修饰important,构成形容词短语,作matters的后置定语,them指代Americans。
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