摘要：2．My brother is really .He often works in his office far into the night. A．open­minded B．hard­working C．self­confident D．warm­hearted 解析:选B.考查合成形容词的词义辨析.通过第二句的“works in his office far into the night 可知“我 哥哥是个勤奋的人.故正确答案为B.

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