第3题中,must have known是“一定知道了”,此处must表示判断,反义疑问句用have/has,因为police是个集体名词,只能作复数,所以选C,不过我觉得答案应该是haven't they.
第8题中,含有宾语从句中的主句是I think时,反义疑问句应该对从句反问,正确答案应该是"isn't he"
3.The police must have known all about this,______?
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英语翻译We must be well known to customers before all the shows