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单项选择题

Thomas Alva Edison is known as one of the greatest inventors of his time. He was awarded more patents (专利权) on inventions than any other Americans. When he died in 1931, Americans wondered how they could best show their respect for him.
One suggestion was that the nation observe a minute or two of total blackout (停电). All electric power would be shut off in homes, streets and factories. Perhaps this suggestion plan made Americans realize fully what Edison and his inventions meant to them. Electric power was too important to the country. Shutting it off even a short time would have led to complete confusion. A blackout was out of the question.
On the day of Edison’s funeral (葬礼), many people silently dimmed their lights. In this way they honored the man who had done more than anyone else to put the great force of electricity at his countrymen’s fingertips.

People decided to honor Edison when ______.
A. he made his electric light
B. the first invention was made
C. he died more than 70 years ago
D. the country realized the importance of electricity
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