All passengers______go through safety check before they take a plane.
#74193
A
can
B
may
C
must
D
ought
推荐题目
Look! We can’t cross the bridge. It   by some workers.
#77698
A
repairs
B
is repaired
C
is being repaired
D
is repairing
The manager demanded that the work________ within three days.
#62720
A
was finished
B
had been finished
C
be finished
D
finished