单项选择题

(When) Edison died, it was proposed that the American people (turned off) (all power) in their homes,streets, and factories for several minutes (in honor of) this great man.

A．When
B．turned off
C．all power
D．in honor of
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单项选择题
Just as the value of a telephone network increases with each new phone ____________ to the system, so does the value of a computer system increase with each program that turns out.
A．adding
B．to have added
C．to add
D．added
单项选择题
For the new country to survive, ____________ for its people to enjoy prosperity, new economic policies will be required.
A．to name a few
B．let alone
C．not to speak
D．let''s say
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