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._出国考试答疑器_GMAT_试题

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题目：

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.

选项:

A、as

B、than

C、that

D、of what

E、at which

答案:

C

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that前面不是不能加逗号吗

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