He sat on his bed looking at his brother, had his arms crossed and looked angry. A. thatB

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A. that
B. whom
(答案→)C. who
D. which
解析：通过分析句子结构，可知这是一个主从复合句，其中包含一个非限制性定语从句，that不能用于引导非限制性定语从句，故排除A，关系词在定语从句中作主语，且是人，故用who。