My brother is really ______. He often works in his office far into the night.A.open-mindedB.hard-workingC.self-confidentD.warm-hearted
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B解析解析：本题考查复合形容词的词义辨析。A．open-minded：思想开放的；B．hard-working：勤勉的，努力工作的；C．self-confi-dent：自信的；D．warm-hearted：热心的。根据第二句已知信息--他经常在办公室工作到深夜，可知第一句句意应为：我哥哥是个努力工作的人。故选B。