单选题There is a growing realization that the only（）way to achieve further reductions in vehicle emissions is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.AeffectiveBefficientCsufficientDSupplement
单选题
There is a growing realization that the only（）way to achieve further reductions in vehicle emissions is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.
A
effective
B
efficient
C
sufficient
D
Supplement
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