求解A new hair-growing drug is

缺氧

A new hair-growing drug is being sold for three times the price, per milligram, as the drug’s maker charges for another product with the same active ingredient

as

than

that

of what

at which    

答案选D啊，但很晕，那是个啥结构？！我选的A。求解，谢谢

yuyi325

去掉中间per milligram，就是三倍于另一种产品的价格。。

EVENINE

prep居然选c，我觉得我见鬼了···

sylvieliu

答案不是C么。。。求解····

sylvieliu

C goes well here.

three times the price that X charges for Y. That modifies/refers to price.