—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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—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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