题目内容

--- Did you see the traffic accident yesterday?

--- Yes. It happened when I ________ past the museum.

[  ]

A.walk
B.am walking
C.will walk
D.was walking

答案:D
解析:

when引导时间状语从句,意为“当……时候”,主从句时态要一致,主句为一般过去时,故从句只能为过去的某种状态。


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