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.
我觉得是D charge of 这样的理解对吗?
再者,CD的答案是C 一定有道理在里面,谁能帮我解答下 或提供下当时讨论这道题的帖子~~~~
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