( ) his leg was badly injured, the boy managed to attend class

( ) his leg was badly injured, the boy managed to attend class every day.
A、If
B、Unless
C、Although
D、Because
【正确答案】：C
【题目解析】：根据语义，句子逻辑关系为转折，尽管他的腿受伤厉害，但是小男孩坚持每天上课。