Had we assisted him , he ________ us a hand ________ today . 
#87888
A
would have given ; in exchange
B
should give ; to exchange
C
could give ; in exchange
D
might have given ; to exchange for
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He commanded that the students ______the classroom before he returned.
#86770
A
didn’t leave
B
wouldn’t leave
C
not leave
D
couldn’t leave
But for your help,I ________ the place.
#87108
A
can’t find    
B
can’t have found
C
couldn’t have found
D
haven’t found