问题标题：
1.过去进行时如何分辨did与was/weredoing?2.单选：I_______whenhearrived.AwasshoppingBshoppedCshoppingDshops3.单选I____whilehewasplayingthepiano.AwasshoppingBshoppedCshoppingDshops4.填空what______you____wh
问题描述：
1.过去进行时如何分辨did与was/weredoing?
2.单选：I_______whenhearrived.
AwasshoppingBshoppedCshoppingDshops
3.单选I____whilehewasplayingthepiano.
AwasshoppingBshoppedCshoppingDshops
4.填空what______you____whenhearrived?
5.填空what_______you_______whilehewasshopping?
高琴妹回答：
1、过去式用did,过去进行时用was/weredoing
2、A
3、A
4、weredoing
5、weredoing
这里需要注意whenwhile的区别.
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