她必须在五点前到达机场。

She has to arrive at the airport by 5 o'clock.

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She has to arrive at the airport by 5 o'clock.

has 是动词 have 的第三人称单数现在时形式,在这里与 to 连用构成 have to 结构,表示"必须"或"不得不"的意思。

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