must do sth 是说必须做某事
must not do sth 是说没必要一定做某事
must be 表示肯定的推测
当表推测时,它的否定形式 就是can not be 不能用must not be 没有这种说法,没有为什么...
请问这句话为什么选Can'tShe__________be ill because I saw her playing
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