Last night Li Ping watched the football match at home when he ________ his homework. 
#87936
A
need have done
B
must haven done
C
should have done
D
could have worked
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They took the injured straight to the hospital, otherwise he        .
#86512
A
would die
B
should have died
C
might die
D
might have died
They got two free tickets to Canada, otherwise they______ able to afford to go.
#90047
A
wouldn’t have been
B
mustn’t have been
C
wouldn’t be
D
hadn’t been