While the boy down the street, the UFO landed． [ ] A．had walked B．was walking C．has walked D．is walking 题目和参考答案——青夏教育精英家教网—

题目内容

While the boy ________ down the street, the UFO landed．

[　　]

A．had walked

B．was walking

C．has walked

D．is walking

答案：B

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