【题目】There was not an empty seat anywhere in the concert hall at last Thursday's event, it was an extremely cold night.
A.when
B.because
C.if
D.although

【答案】D
【解析】句意：上周四的活动中，音乐大厅里一个空座都没有，尽管那是一个寒冷的夜晚。根据前后句的逻辑关系，可知选D。