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A．may grow
B．must grow
C．can grow
D．should grow
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单项选择题Which country won the goal medal in the men’s 4×100 metres relay

A．Britain.
B．France.
C．Trinidad & Tobago.
D．The United States.

单项选择题Why does VOIP cost less

A．Because it uses separate service providers.
B．Because it needs less working stuff to offer service.
C．Because service is provided through e-mail.
D．Because service is charged monthly.