单项选择题
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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Henry and Tom（）to the particles at the Trade Union every Saturday.
A.used to go
B.were used to go
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Ethanol is commonly used（）a gasoline supplement.
A.for
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C.by
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The combustion of larger molecules,（）have multiple carbon-carbon bonds involves a more complex series of reactions.
A.what
B.which
C.that
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