__(concern) about Tom,the teacher called his parents to find out why he was absent from class.

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__(concern)aboutTom,theteachercalledhisparentstofindoutwhyhewasabsentfromclass.__(concern)aboutTom,t

__(concern) about Tom,the teacher called his parents to find out why he was absent from class.
__(concern) about Tom,the teacher called his parents to find out why he was absent from class.

__(concern) about Tom,the teacher called his parents to find out why he was absent from class.
concerning
用现在分词代替原因状语从句