we forget that they must have been gloomy and murky places at night

17/50

we forget that they must have been gloomy and murky places at night. It is mentioned in the passage that before the electric lamp was invented .............

oil lamps and then candles were used

candles and oil lamps appeared about the same time

candles and then oil lamps were used

people did not use any form of lighting in their houses

Giải thích

Đáp án C
Thông tin ở 2 câu đầu của đoạn cuối: For centuries homes were lit by candles until oil was found. Even then, oil lamps were no more effective than a cluster of candles.
Trước khi đèn điện được phát minh thì nến, sau đó là đèn dầu được sử dụng.