They must have been here the day before yesterday,____? 
#89896
A
mustn’t they
B
didn’t they
C
mustn’t have they
D
had they
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“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
#89543
A
might fall out
B
could fall out
C
should have fallen out
D
must have fallen out
 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
(2009·江苏高考)He did not regret saying what he did but felt that he________it differently.
#86527
A
could express
B
would express
C
could have expressed
D
must have expressed