单项选择题

The strong storm ______ all the power lines in this region.

A．knock over
B．knock out
C．knock at
D．knock up
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单项选择题
_______him tomorrow
A．Why not to call on
B．Why don’’t call on
C．Why not calling on
D．Why not call on
单项选择题
Not only was the paper money ______ which Napoleon so graciously distributed to the unfortunate, but even silver lost its value in relation to gold.
A．invaluable
B．valueless
C．priceless
D．valuable
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