—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 |
推荐试卷
—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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