问题标题:
【Didyouseethetrafficaccidentyesterday?Yes,Isawit____whenI____pasttheschoolgate.A.happen;walkB.happen;waswalkingC.happened;walkingD.happening;havewalked】
问题描述:

Didyouseethetrafficaccidentyesterday?Yes,Isawit____whenI____pasttheschoolgate.

A.happen;walkB.happen;waswalkingC.happened;walkingD.happening;havewalked

代进进回答:
  Didyouseethetrafficaccidentyesterday?Yes,Isawit____whenI____pasttheschoolgate.   A.happen;walkB.happen;waswalkingC.happened;walkingD.happening;havewalked   B.happen;waswalking   seesbdosth所以接原型happen   而意思上是当我正经过学校门口时看见的又已经发生了所以用过去进行时
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