急救:一道语法题目!!!!:)谢谢

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以下是引用mbz在2007-2-9 23:01:00的发言：

还望各位多多体会

mbz

以下是引用Mayanist在2007-2-10 4:25:00的发言：

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.

A. as      B. than     C.that     D. of what      E. at which

If per milligram were omitted, it is ok to say:
    A new hair-growing drug is being sold for three times the price that the drug’s maker charges for another product with the same active ingredient. 逻辑上的意思是：A new drug is sold for 3 times the price X. the drug's maker charges price X for another product. 但是在题目中，如果用that违反两个原则：1）非限定定语从句先行词是物品时，引导词只能是which; 2）定语从句要紧跟先行词。
     看看price的一种用法： The project originally aimed for a price of 100 United States dollars.
     如果将 three times the price 看作是 three times the price of xxx$ 的省略形式， 那么 of what 作为答案可以好理解一点？毕竟three times 应该指数字上的关系。

还望多多体会