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填空题
Before the flight takes off, all passengers are asked to (fast) ____ their seat belts.
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解析：
本题考查词性转换。句意：在飞机没起飞前，所以的乘客都被要求系好安全带。由ask sb. to do sth.可知，to后接不定式动词原形，即需要把形容词fast转换为动词fasten，意为“把……拴紧”。
本题考查词性转换。句意：在飞机没起飞前，所以的乘客都被要求系好安全带。由ask sb. to do sth.可知，to后接不定式动词原形，即需要把形容词fast转换为动词fasten，意为“把……拴紧”。
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