题干
─ _____ do you do the dishes?
─ Every day.
A：How soon
B：How long
C：How often
D：When
答案(点此获取答案解析）
C
─ _____ do you do the dishes?
─ Every day.
A：How soon
B：How long
C：How often
D：When
的公比
，前n项和为
，则
（ ）