We shouldn't smoke and eat or drink here.是用and 还是or?

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• We shouldn't smoke and eat or drink here.是用and 还是or?
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• we shouldn't cross the street when the light _____ red .是用is 还是changes.请说明理由.
• 初二英语科代表不明白一道英语题：You shouldn't eat ( ) 24 hours.A.anything in B.anything for我选B,理由是,老师给我们做的练习册里面有类似这句的句子,只不过主语是He,其他都一样.我之前改练习册的时候看了答案,答案里面是anything for,而我做了in,所以马上改了回来.但是老师说选A,理由很牵强：1.跟其他老师讨论出来的结果 2.在24小时之内,因为“之内”,所以用in 3.很少见过用for的 立场非常不坚定,模棱两可：她说,anything for也是对的,但是anything in就最好.如果考试中有两个答案你就选anything in,如果没有,anything for也没错.我彻底晕倒!选A还是B?要理由难道没有语法来证明对错吗?为什么你们都说“靠感觉”? 既然如此,那么请你们解释一下,为什么我那本练习册里面的答案是选B,句子是一样的,但就是选B!注意,没有印刷错误的可能! 语法,给语法
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