I'm thirsty.Can I drink some water from the tap?No.You __(mustn't/ought not) to drink tap water

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I'm thirsty.Can I drink some water from the tap?No.You __(mustn't/ought not) to drink tap water

I'm thirsty.Can I drink some water from the tap?No.You __(mustn't/ought not) to drink tap water
I'm thirsty.Can I drink some water from the tap?No.You __(mustn't/ought not) to drink tap water

I'm thirsty.Can I drink some water from the tap?No.You __(mustn't/ought not) to drink tap water
ought not

注意题干后面有个to
ought not to do sth 不应该做某事

用mustn't “禁止”的话, 后面也应该是动词原形, 没有to
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ought not 不应该。还因为它后面用不定式。即ought not to do sth所以选它。而mustn't+ do