单项选择题

—Must I turn off the light when I leave
—No, _________.

A．you mustn't
B．you can't
C．you needn't
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单项选择题
In today's lesson we will __________ the British system of government with the American.
A．take
B．provide
C．compare
单项选择题
We telephoned to __________ our mother's uneasiness.
A．reduce
B．decrease
C．relieve
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