[問題]GWD-4-Q4

[BOY]

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

這題答案為什麼是(D)..?
謝謝..

[stilalala]

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

這題答案為什麼是(D)..?
謝謝..

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