35.The boy was walking down the street .the UFO landed. A.when B.after C.before D.until 【查看更多】

 

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The boy was walking down the street         the UFO landed.

A.when    B.after             C.before             D.until

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The boy ____ down the street when the UFO landed(着陆).

[  ]

A.walk

B.was walking

C.walked

D.is walking

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