In this school, students work very hard, they are very happy.
A. although, /
B. although, but
C. /, although
D. but, although
网友回答
(答案→)A. although, /
B. although, but
C. /, although
D. but, although
解析： 考察关联词的使用。关联词不能两个连用，排除BD。Although放在句首
句意：在这个学校里，尽管学生们努力学习，但他们依然很开心。前后转折，故选A