(2014·东北三校模拟)________aboutthestudent,theteachercalledhisparentstofindoutwhyhewassooftenabsentfromclass.A.ConcerningB.ConcernC.Concerned D.Toconcern... (2014·东北三校模拟)________about the student,the teacher called his parents to find out why he was so often absent from class. A.Concerning B.Concern C.Concerned D.To concern 展开