Before the flight takes off, all passengers (ask) ______ to fasten their seat belts.

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问题 Before the flight takes off, all passengers (ask) ______ to fasten their seat belts.

选项

答案are asked

解析 本题考查被动语态。此处主语all passengers应为动词ask动作的受动者,故该句应该使用被动语态。又因此句为一股现在时,主语又是复数形式,故用are asked。
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