单项选择题

When Edison died, it was proposed that the American people ______ all power for several minutes in honour of this great man.

A．turned off
B．turn off
C．would turn off
D．must turn off
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单项选择题
______ is called erosion (侵蚀).
A．Land which wears away,
B．The wearing away of land
C．To wear away land
D．Wearing away land
单项选择题
Our living standard is still very low, but we are ______ living in poverty.
A．by all means
B．by no means
C．by every means
D．by means of
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