Many people think that ATC consists of a row of controllers sitting in front of their radar screens at the nation's airports, telling arriving and departing traffic what to do.
请问这句话中的telling分词短语是做状语（逻辑主语是ATC) 还是做定语（逻辑主语是controllers），谢谢各位老师!
telling现在分词短语是sitting的伴随状语，是sitting这个分词短语的内部成分，从sitting到句末整体是sitting分词短语，作controllers的定语。
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