单项选择题

The manager promised to have my complaint ______.

A．looked through
B．looked into
C．looked over
D．looked after
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单项选择题
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
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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