单项选择题

The suggested plan was to ______.

A．turn on all lights
B．mm off all electricity for a short time
C．shut off the fights in cities
D．dim all lights
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单项选择题
Which of the following statement is true according to the first paragraph
A．Edison received the first American patent.
B．Edison got the most patents in America at that time.
C．Edison was the only American inventor.
D．Edison was the first American inventor.
填空题
Can you help me to get those letters (mail) ______
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