If       unsolved, the problem of food safety may lead to more serious results.
#80315
A
having left
B
to leave
C
left
D
leaving
推荐题目
      that I advised them to go to see it.
#84324
A
It was so exciting film
B
So exciting a film was it
C
It was such exciting film
D
So an exciting film was it
So much of  interest ___ that most visitors simply run out of time before seeing it all.
#84490
A
offers Beijing
B
Beijing offers
C
does Beijing offer
D
Beijing does offer
At the sight of the policeman _____from behind the door.
#82564
A
did the boy rushed out
B
rushing out was the boy
C
out rushed the boy
D
the boy was rushing out