单项选择题

______ both sides accept the agreement ______ a lasting peace be established in this region.

A．Only if, will
B．If only, would
C．Should, will
D．Unless, would
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The largest system serving e-mail messengers is the Internet, a ______ of millions of computers linked worldwide.
A．unity
B．combination
C．network
D．connection
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There is not a conductor ______ resists the flow of the electrical charges.
A．which
B．but
C．that
D．it
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