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.
答案是D,求解?
应该是C吧
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=53670
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http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=72871&page=3
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