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1. -Must I stay at home, Mum? --No, you ______. A. neednt B. mustnt C. dont D. may not 2. -Who is the man over there? Is it Mr Li? --No, it ______ be him. Mr Li has gone to America. A. mustnt B. may not C. cant D. neednt 3. To make our city more beautiful, rubbish ______ into the river. A. neednt be thrown B. mustnt be thrown C. cant throw D. mustnt throw 4. -Must we hand in the papers now? --No, you ______. A. cant B. may not C. mustnt D. neednt 5. You_____ to the meeting this afternoon if you have something important to do. A. neednt to come B. dont need come C. dont need coming D. neednt come 6. Youd better _____late again. A. dont B. not be C. not being D. wont be 7. You _______ smoke in the hospital. A. neednt B. oughtnt to C. ought to not D. may not 答案与解析： 1. A.用must来提问，肯定回答用Yes, you must;否定回答用No, you neednt 或No , you dont have to, 故选A. 2. C. 完全否定的猜测用canmustnt表 禁止、不许，不用在否定猜测中，排除; may not 表可能不是，用在不确定猜测中，但根据Mr Li has gone to America.可知 may not不符合句意，排除;neednt表不需要，不符合句意，排除。 | 
