about Lucy, the teacher called her parents to find out why she was so often absent from class．
A. Concerning
B. Considering
C. Concerned
D. Considered
网友回答
A. Concerning
B. Considering
(答案→)C. Concerned
D. Considered
解析：考查非谓语动词。be concerned about“关心”，在句中作状语，故选C。