关于have to/must be与don't have to/can't be
have to与must be
don't have to与can't be
的意思一样,在使用过程中有何区别
人气：432 ℃ 时间：2020-01-27 12:38:56
解答
have to表示不得不
must be 必需做
don't have to 不必做
can't be 不能做
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