单项选择题

The political future of the president is now hanging by a______

A．thread
B．cord
C．string
D．rope
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I'll call you tonight at 10 o'clock ______ I can find a telephone that works.
A．unless
B．suppose
C．provided
D．when
单项选择题
Could you ______ me to the railway station, please
A．show
B．direct
C．lead
D．indicate
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