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
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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
单项选择题
If you ______ Jerry Brown until recently, you'd think the photograph on the right was strange.
A．shouldn't contact
B．weren't to contact
C．didn't contact
D．hadn't contacted
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