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信息发布者：
ake
ust
tudents
ustn't
mustn't/can't/
shouldn't
作业精灵老师示例
S1：To cross the road safely, what must you do?
S2：I must look for a zebra crossing and look at the traffic lights.
S1：To cross the road safely, what mustn't you do?
S2：I mustn't play football on the road or play on the zebra crossing.
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