分类：教育/科学-学习帮助
问题：请教（　）Shemustbeinherroom,___?（　）S 
（　）She must be in her room , ___?A.  isn’t she B.  is she.  mustn’t sheD.  needn’t she
回答：A肯定
此累题应该根据MUST后面的而行。再举一例：
He must have finshed his homework,haven,t he?