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