China's top diplomat in the United States refuted the claims that his country has underreported the number of COVID-19 cases and related deaths, suggesting instead that the accusers usually have things under their "dirty carpet". 

suggesting是做refute的伴随状语还是做claims的非限定性定语 句意上应该是做伴随状语，“外交官反而暗示美国…” 学生想学习一下这两种用法的辨别依据。