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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:2089

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
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InJanuary,2004,theUnitedStates