问题描述：
They sat down and nobody ------for a long time.
1>They sat down and nobody ------for a long time.
spoke talk
--May I go now?
---No,you----.You ----stay here.needn't ;must .mustn't;has to.请问选哪一个,为什么?
1>They sat down and nobody ------for a long time.
spoke talk
--May I go now?
---No,you----.You ----stay here.needn't ;must .mustn't;has to.请问选哪一个,为什么?
问题解答：
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