[求助]再问GWD 2-21:GWD 4-4:GWD13-8

繁华背后

GWD 2-21:GWD 4-4:GWD13-8

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.

1. as

2. than

3. that ( CD answer)

4. of what (GWD answer)

5. at which

我觉得是D  charge of   这样的理解对吗？

再者，CD的答案是C 一定有道理在里面，谁能帮我解答下 或提供下当时讨论这道题的帖子~~~~

AlienX

對, D還原後是
the drug’s maker charges of something for another product with the same active ingredient.
妳會發現, 句子完全不make sense.

AlienX

oh, LZ可以下新的prep破解, 很多的GWD都在其中...有GMAC的official answers ;-)

繁华背后

恩 好 谢谢！