What does the idiom "to burn the midnight oil" mean?

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A To waste resources on a lost cause
B To work or study late into the night
C To cause a sudden dispute
D To act hastily without preparation

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Answer: B. To work or study late into the night

The phrase comes from the historical practice of using oil lamps to see while working or reading late at night.

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What does the idiom "to burn the midnight oil" mean?

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