GWD - of what 请帮忙！

zcy11234

Q4:

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.

C D

1. as
2. than
3. that
4. of what
5. at which

确实没弄明白，这个of what 到底是怎么用的？

谢谢！

[此贴子已经被作者于2009-4-8 13:42:25编辑过]

alohabrian

这题OA是C,GWD答案错了。

D的 what the drug's maker charge 就等于 price，于是就变成了 price of the price，这样是不可能的。