他们正要离开那幢房子时，突然听到火警警报器在背后尖声响起。(be about to)They were about to leave the house when they heard a fire alarm screaming behind them.

他们正要离开那幢房子时，突然听到火警警报器在背后尖声响起。(be about to)They were about to leave the house when they heard a fire alarm screaming behind them.

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