Unless ________ , the murderer is likely to commit similar or further offences. 
#97216
A
to arrest
B
arrested
C
been arrested
D
arresting
推荐题目
Mr Green showed his students some photos ________ at World Expo 2010 Shanghai.
#93152
A
taken
B
being taken
C
to be taken
D
having taken
The river is said __________ in a fire during the past 10 years. 
#91800
A
to have polluted
B
it has been polluted
C
to pollute
D
to have been polluted