While the boy ______ down the street, the UFO _____ . 
#41890
A
was walking; was landing
B
walked; landed
C
was walking; landed
D
walked; was landing
推荐题目
Beijing ______a lot in the past ten years. Now it has become one of the biggest modern______ in the world. 
#38493
A
changes, cities
B
changed, city
C
changed, cities
D
has changed, cities
Listen, a small number of students ______ in the classroom. 
#40135
A
talk
B
talks
C
is talking
D
are talking
Please hand in your homework as soon as it_________.
#42020
A
finishes
B
will finish
C
is finished
D
will be finished