单选题However, since methanol-fueled vehicles could be designed to be much more（）than gasoline clone vehicles fueled with methanol, they would need comparatively less fuel.AeffectiveBefficientCsufficientDsupplement
单选题
However, since methanol-fueled vehicles could be designed to be much more（）than gasoline clone vehicles fueled with methanol, they would need comparatively less fuel.
A
effective
B
efficient
C
sufficient
D
supplement
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