再一道prep~

Jennifer789

A new hair-growth 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.

A. as

B. than

C. that

D. of what

E. at which

选C。为什么呢？？  我选的是D，不是有the price of的说法

Jennifer789

哦哦  没有看到了 呵呵  谢谢！

edwardelric

这里不能用 what 是因为已经说了 three times the price，后面的都是 price 的定语，所以要用 that 来带出。要用 what 的话，就要这样说： . . . sold for three times more than what the drug's maker charges .