This problem may lead to more serious ones if _____ unsolved.
#94478
A
left
B
keeping
C
remained
D
making
推荐题目
I got to the office earlier that day,   the 7:30 train from Paddington
#90663
A
caught
B
to have caught
C
to catch
D
having caught
The document film ______ next week aims at introducing local cultures to the world.
#90702
A
released
B
being released
C
to be released
D
having been released
          in the river for five hours, the thief looked very pale and exhausted.
#94452
A
Having been trapped  
B
Being trapped  
C
Trapping
D
Having trapped