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
Is this the knife ______
A．for which you are looking
B．for that you are looking
C．which you are looking for
D．that you are looking
单项选择题
By moving the radar beam around slowly in circles, we can ______ the surroundings.
A．explore
B．expose
C．exploit
D．expand
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