_________ across the railway, a train hit it.
#67607
A
While walking
B
Walking slowly
C
As the little pig walking
D
While the little pig was walking
推荐题目
Make marks _______ you have questions. 
#66894
A
which
B
in which
C
where
D
in where
Can you tell me______?
#72732
A
who is that gentleman
B
that gentleman is who
C
who that gentleman is
D
whom is that gentleman
The experiment shows that proper amounts of exercise, if _____ regularly, can improve our health.
#67898
A
being carried out
B
carrying out
C
carried out
D
to carry out