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
There  _____ a football match this afternoon.
#38107
A
have
B
has
C
is going to have
D
is going to be
 Three bridges ________ over the river five years ago.
#36293
A
built
B
build
C
were built
D
are built
Mr. Green, a famous writer, ____________ our school next week.
#38983
A
visited
B
visits
C
was visiting
D
will visit
Tom wants to be a singer and he_____. singing lessons to do it.
#38875
A
took
B
has taken
C
is taking
D
was taking.