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All male guests at this restaurant are respectfully requested that they are put on coat and tie.

【参考答案】

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。
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