sweatfly

这道题好像和下面的这个GWD-4-Q4有点类似GWD-4-Q4GWD-13-Q8

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
5. at which

倍数后面加that,表示"是...的多少倍", 然后从简洁的角度讲,D是最短的.

open to discuss.