题干
- Would you like to go out to play basketball with me?
-___________, but I should finish my homework first.
A：It's hard to say
B：You're welcome
C：I'd love to
D：You're right
答案(点此获取答案解析）
C
展开式中各项二项式系数之和为
，
展开式中各项系数之和为
，则
=" " （ ）
