给定一系列顶点：P0P1P2...Pn-1Pn，怎样才能画一条二次B样条曲线，使得它插值端点P0、Pn，且在起点处相切于P0P1，在终点处相切于Pn-1Pn?()

A.增加端点P0/=2P0-P1，Pn/=2Pn-Pn-1

B.将原端点替换为P0/=2P0-P1，Pn/=2Pn-Pn-1

C.增加端点P0/=P0-2P1，Pn/=Pn-2Pn-1

D.将原端点替换为P0/=P0-2P1，Pn/=Pn-2Pn-1