问题标题:
AsI___(walk)downthestreet,I___(meet)Charile.
问题描述:

AsI___(walk)downthestreet,I___(meet)Charile.

方祖祥回答:
  AsI_waswalking__(walk)downthestreet,I_met__(meet)Charile.   当我走下街道时,我遇见了Charile.   走是持续动作,所以用ing形式,遇见是短暂性动作,所以用过去式.
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