My most devoted friend, Professor Yang, _______ often go hiking when he lived in the mountain that was covered with forest.
#87639
A
would
B
should
C
could
D
might
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The man in prison insisted that he _______ nothing wrong and _______ set free.
#88178
A
should do, should be
B
had done, should be
C
had done, had been
D
should do, had been
If only I_____how to operate a computer as you do! 
#89926
A
had known
B
wou欤?know
C
should know
D
knew
The professor gave orders that the test ____before 5:30.
#86937
A
be finished
B
will finish
C
will be finished
D
shall finish