Before the flight takes off, all passengers are asked to (fast) ________ their s

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问题 Before the flight takes off, all passengers are asked to (fast) ________ their seat belts.

选项

答案 fasten

解析本题考查词形转换动词不定式。本句译文：飞机起飞之前，所有乘客都需系好安全带。动词不定式后应接动词原形，动词fasten“扣紧，系牢”为形容词fast的词形转换。

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