—When did the computer crash?
—This morning,while I ________ the reading materials downloaded from some websites.
【选项
A.have sorted |
B.was sorting |
C.am sorting |
D.had sorted |
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—When did the computer crash?
—This morning,while I ________ the reading materials downloaded from some websites.
【选项
A.have sorted |
B.was sorting |
C.am sorting |
D.had sorted |