While the boy ______ down the street, the UFO _____ .
| A．was walking; was landing |
| B．walked; landed |
| C．was walking; landed |
| D．walked; was landing |
While the boy ______ down the street, the UFO _____ .
| A．was walking; was landing |
| B．walked; landed |
| C．was walking; landed |
| D．walked; was landing |
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