单项选择题

Lincoln proclaimed that the problem of setting free the. black slaves should immediate solution.

A．call off
B．call for
C．call on
D．call in
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单项选择题
Although Mike worked ______ , he could ______ support his family.
A．hard, hard
B．hard, hardly
C．hardly, hard
D．hardly, hardly
单项选择题
Mr. Johnson preferred ______ heavier work to do.
A．to be given
B．to he giving
C．to have given
D．having given
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