All those about the poor children should be .A. concerned; thankedB. are concerned; thank

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(答案→)A. concerned; thanked
B. are concerned; thanked
C. who are concerned; thanked for
D. are concerned; thanked for
解析：考查非谓语动词。be concerned about“关心......”concerned是形容词化了的过去分词，concerned作后置定语，修饰those。句意“所有关心贫困孩子的人都应该被感谢。”故选A。