must be:一定是；必然是.（是建立在几乎完全合理或大量证据基础上的推断.）
must:必须
have to be:不得不是；只（可能）是.（这个要看具体语境了.最可能的语境是在所有其他可能性都排除后的仅有的可能.大多也用于近乎确凿的推断.）
have to:不得不
must be,must和have be,have的区别
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