34．While the boy down the street, the UFO landed． A．had walked B．was walking C．has w——青夏教育精英家教网——

摘要：34．While the boy down the street, the UFO landed． A．had walked B．was walking C．has walked D．is walking

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While the boy down the street, the UFO landed．

A．had walked B．was walking C．has walked D．is walking

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

A．had walked

B．was walking

C．has walked

D．is walking

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

had walked

was walking

has walked

is walking

查看习题详情和答案>>