—— Do you still remember the day when we went to the Great Wall? —— I can’t remember it well, but______sometime last autumn? 
#89872
A
might it be
B
could it have been
C
could it be
D
must it have been
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He       have come here yesterday,        he?
#89653
A
mustn’t;did
B
couldn’t;has
C
mustn’t;haven’t
D
must;didn’t
The weather turned out to be fine yesterday. I          the trouble to carry my umbrella.
#86907
A
needn’t take
B
couldn’t take
C
needn’t have taken
D
couldn’t have taken