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Must,Have to and Need to 辨析 - 知乎 - 知乎专栏
【基础英语】have to 和 need to 有什么不同? | Engoo 线上英语
What is the difference between 必须, 得, 必需, and 需要?
have 的用法要点 - 英语语法网
need,must 和 have to 的区别 - 百度知道
动词用法:have 的用法要点 - 新东方在线网络课堂
BBC Learning English - 一分钟英语 / “Must” 和 “have to” 的区别
Need to, have to, should之间有什么细微差别?这三个总是可以互 …
must 的否形式的特殊性,使它与 have to 或 need to 的区别越发 …
必须与需要:差异与比较 - Ask Any Difference
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