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InJanuary,2004,theUnitedStatessuccessfullylaunched“Spirit”,aMarsExplorationRover,anewmilestoneinthehistoryofmankind.A.itmarkedB.markingC.markedD.tomark

题目详情
In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
A.it marked B.marking C.marked D.to mark
▼优质解答
答案和解析
B

marking是分词作结果状语,表示”标志着”。