All male guests at this restaurant are respectfully requested that they are put on coat and tie.
正确答案:are put on应改为put on[解析] 此题考查虚拟语气的用法。表示“要求”的request后接的宾语从句，谓语动词要用should+动词原形，should可省略。此句中“穿衣服”应该用主动形式，故用put on。
答案解析:有
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All male guests at this restaurant are respectfully requested that they are put on coat and tie.
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