摘要：35．The boy was walking down the street ．the UFO landed． A．when B．after C．before D．until
网址：http://m.1010jiajiao.com/timu_id_1354011[举报]
The boy ____ down the street when the UFO landed
（着陆）.[ ]
|
A ．walk |
B ．was walking |
C ．walked |
D ．is walking |