My brother is really . He often works in his office far into the night.A. open-mindedB. ha

问题补充：

My brother is really . He often works in his office far into the night.

A. open-minded

B. hard-working

C. self-confident

D. warm-hearted

答案：

A. open-minded

(答案→)B. hard-working

C. self-confident

D. warm-hearted

解析：该题考查考生对题干中两个句子含义的理解以及对选项中四个复合形容词含义的理解。通过第二句的“works in his office far into the night”可知“我”哥哥是个勤奋工作的人。