问题描述：
Li Ping was late again.he promised -----late the next time
A not to B not to be C don't be D not be
如果选B,不是说后面是动词不定式要有don't或者doesn't吗
A not to B not to be C don't be D not be
如果选B,不是说后面是动词不定式要有don't或者doesn't吗
问题解答：
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