题干
What you at the moment?
A：are; do
B：do; do
C：are; doing
D：do; doing
答案(点此获取答案解析）
C
What you at the moment?
A：are; do
B：do; do
C：are; doing
D：do; doing
的前n项和为
，且
则公比q等于 （ ）