GWD13-8

sammen

13-8 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.
A as
B than
C that
D of what
E at which
这题的答案是E,我看着C,D好像都可以有都有问题,晕了,请NN们解答.