单选题Vehicles（）only the simplest of the engine improvements that methanol makes feasible would still contribute to an immediate lessening of urban air pollution.AcorporateBcooperatingCoperatingDincorporating
单选题
Vehicles（）only the simplest of the engine improvements that methanol makes feasible would still contribute to an immediate lessening of urban air pollution.
A
corporate
B
cooperating
C
operating
D
incorporating
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