用mustn't 或must完成句子。1.Cars, buses and bikes ______ go when the traffic light is red.2. The flowers______be watered every day, or it'll die.3. No m-初中英语-魔方格

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用mustn't 或must完成句子。
1.Cars, buses and bikes ______ go when the traffic light is red.
2. The flowers______be watered every day, or it'll die.
3. No matter who wants to come in,he ______ knock on the door first.
4. You must speak to the old politely, ______you?
5. The children ______swim in the lake. It's not safe.
6. I haven't seen Alice several years. She ______be a big girl.

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◎ 知识点

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