The boy___ down the street when he UFO landedA.was walking B.is walking C.has walked D.walks

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The boy___ down the street when he UFO landedA.was walking         B.is walking    C.has walked     D.walks

The boy___ down the street when he UFO landedA.was walking B.is walking C.has walked D.walks
The boy___ down the street when he UFO landed
A.was walking B.is walking C.has walked D.walks

The boy___ down the street when he UFO landedA.was walking B.is walking C.has walked D.walks
答案选A.was walking
从when he UFO landed这句话的时态----过去时可以判断出前面要用过去进行时

A

A

A.
when he UFO landed是过去时,那时候这个男孩正在走