He did not regret saying what he did but felt that he ______ it differently.
#90433
A
could express
B
would express
C
could have expressed
D
must have expressed
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She________the film. She knows nothing about it. 
#89871
A
can’t see
B
can’t have seen
C
must see
D
mustn’t have seen
As a graducate in computer science, he ___ to work out the problem.
#89044
A
wouldn't have failed
B
can't have failed
C
mustn’t have failed
D
might not have failed