China has 34 high-speed rail lines,____ one-tenth of the countrys total railway operation mileage.%Dª.making upB.having made upC.make upD.to make up

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China has 34 high-speed rail lines,____ one-tenth of the countrys total railway operation mileage.%Dª.making upB.having made upC.make upD.to make up

我觉得选A,动名词短句作伴随状语.