题文
— You look scared. What happened?
— Well , I _______ along the street ________ the UFO landed.
| A．was walking ; while | B．is walking ; when |
| C．was walking ; when | D．is walking ; while |
— You look scared. What happened?
— Well , I _______ along the street ________ the UFO landed.
| A．was walking ; while | B．is walking ; when |
| C．was walking ; when | D．is walking ; while |
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