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

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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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