问题补充：
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
答案：
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。
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