nn们请看道题：gwd-4-4-->wycg转移

prfdu2005

    

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
4. of what

    E.at which
答案是d, 可我认为是e, 因为price为后面句子的主语，而后面用到charge for sth at some price. at which 提前，则为e 阿。哪位好心nn可以帮我解答一下？

prfdu2005

不好意思，斑斑，发错地儿了送大家杯茶喝，见谅