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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1237

—When did the computer crash?
—This morning,while I ________ the reading materials downloaded from some websites.(2012·福建)

A.have sorted B.was sorting
C.am sorting D.had sorted
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—Whendidthecomputercrash?—This