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(2) mustûÓÐʱ̬µÄ±ä»¯£¬¶øhave toÓÐʱ̬µÄ±ä»¯¡£

(3) mustµÄ·ñ¶¨ÐÎʽΪmustn¡¯t,ÒâΪ¡°²»ÔÊÐí¡±£¬±íʾ½ûֹijÈË×öijÊ¡£ÓÉmustÒýÆðµÄÒÉÎʾ䣬¿Ï ¶¨»Ø´ðÒªÓÃmust»òhave to,·ñ¶¨»Ø´ðÒªÓÃneedn¡¯t»òdon't have to,Òâ˼ÊÇ¡°²»±Ø¡±¡£

2.  (µ¥ÏîÑ¡Ôñ)

() (1) ¡ªMust I finish my homework before eight o¡¯clock?

¡ªYes,you.

   A. must    B. don't have to

    C. mustn¡¯t   D. need to 

() (2) ¡ªMust I attend the meeting?

¡ªNo,you . You can ask Tom to go instead.

  A. must   B. don't have to

  C. mustn¡¯t   D. had to

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