单选题Ethanol is commonly used as a gasoline supplement, but it is currently about（）methanol.Atwice as expensive asBtwice as more expensive asCas twice more expensive asDas twice expensive as
单选题
Ethanol is commonly used as a gasoline supplement, but it is currently about（）methanol.
A
twice as expensive as
B
twice as more expensive as
C
as twice more expensive as
D
as twice expensive as
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