——I left my handbag on the train, but luckily someone gave it to a railway official.——How unbelievable to get it back! I mean, someone ______ it.
#86384
A
will have stolen
B
might have stolen
C
should have stolen
D
must have stolen
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The officer demanded that such things ______from happening again.
#86715
A
prevented
B
prevent
C
be prevented
D
were prevented
 I was really anxious about you. You___home without a word. 
#89626
A
mustn’t leave
B
shouldn’t have left
C
couldn’t have left
D
needn’t leave
Had I known about this computer program, a huge amount of time and energy       .
#87058
A
would have been saved
B
had been saved
C
will be saved
D
was saved