某血管活性物质的作用是刺激支气管平滑肌强烈持久性的收缩，也使毛细血管通透性增强和促进内分泌作用，该物质是（）

A.血小板活化因子

B.组胺

C.白三烯

D.前列腺素

E.激肽

I would have paid _____ for the dress if the sales girl had insisted, because I really wanted it. [ ]

A. as much twice

B. twice as much

C. twice more than

D. more than twice