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
这道题到底选C还是D??希望nn指教~~~!
自己顶起,希望大家指教!
嗯,我也选的D
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