治疗外周血管痉挛性疾病可选用（）

A.β受体阻断剂

B.β受体激动剂

C.α受体阻断剂

D.α受体激动剂

E.以上均不行

Why _____ come and play basketball with us? [ ]

A. not you

B. don't

C. not to

D. not