Being examined twice a year is the rule that every driver    obey in the city.
#87095
A
shall
B
can
C
ought to
D
need
推荐题目
"They didn’t take measures in time, otherwise the explosions ____."some experts said.
#87726
A
wouldn’t happen
B
didn’t happen
C
wouldn’t have happened
D
mustn’t have happened
Without your help, I ____the exam last term. 
#89943
A
failed in
B
would have failed
C
wouldn’t pass
D
would fail