21． the boy was walking down the street, the UFO landed.A．While 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．Why          B．Where            C．While          D．Whenever

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________ the boy was walking down the street，the UFO landed．

[　　]

A．While
B．After
C．As
D．Before

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________ the boy was walking down the street，the UFO landed．

[　　]

A．While
B．After
C．As
D．Before

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         tile boy was walking down tile street，the UFO landed．

A．While           B．After             C．Before             D．ago

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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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