Who is the man over there? Is it Mr. Wu? — It ________ him, but I am not quite sure.
#74742
A
may be
B
maybe
C
is
D
must be
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He ________ your car by mistake because he didn't have the keys. 
#62484
A
mustn't have taken
B
shouldn't have taken
C
couldn't have taken
D
needn't have taken
I ________ myself more— it was a perfect day.
#62719
A
shouldn’t have enjoyed
B
needn’t have enjoyed
C
wouldn’t have enjoyed
D
couldn’t have enjoyed