GWD-13-8请教

无心

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.

as

than

that

of what

at which

答案是D。不过我也不知道是否一定正确。

rt316

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=56794&page=1