单项选择题

It's time __ you __ relax.

A．for, to
B．to, for
C．for, for
D．to, to
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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
单项选择题
The President declared that the nation's energy demands __ so rapidly since 1968.
A．have grown .
B．had grown
C．grows
D．has grown
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