血友病的治疗错误的是（）

A.输注新鲜血浆

B.输注冷沉淀

C.去氨加压素

D.糖皮质激素

E.关节腔穿刺抽液

The students haven't finished their homework, _____?[ ]

A. do they

B. don't they

C. have they

D. haven't they