单项选择题

Each of us __ a MP3 player.

A．has to
B．have to
C．have
D． has
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单项选择题
It's time __ you __ relax.
A．for, to
B．to, for
C．for, for
D．to, to
单项选择题
As a signatory to the Kyoto pact on climate change, Britain __ carbon emissions by 20 percent by 2010.
A．had reduced
B．must reduce
C．may reduce
D．ought to have reduced
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