C
考查非谓语动词。be concerned about的意思是“担心……”。从句的主语和主句的主语一致，所以从句省略了主语和系动词be。句意为：因为担心这个学生，老师打电话给他的家长想查明他经常逃课的原因。
答案： C
(2014·东北三校模拟)________about the student，the teacher called hi
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