aboutthestudent，theteachercalledhisparentstofindoutwhyhewassooftenabsentfromclass.A．ConcerningB．ConcernC．Concerned
_______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
C
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