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1个英语问题新概念英语二级lesson17中有一句是:In the play,she (must) appear in

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1个英语问题
新概念英语二级lesson17中有一句是:
In the play,she (must) appear in a bright red dress and long black stockings.
句中的must能用have to替换吗?那是替换成那种形式呢(will have to 还是 has to)?
附上原文
My aunt Jennifer is an actress.She must be at least thirty-five years old.In spite of this,she often appears on the stage as a young girl.Jennifer will have to take part in a new play soon.This time,she will be a girl of seventeen.In the play,she must appear in a bright red dress and long black stockings.Last year in another play,she had to wear short socks and a bright,orange-coloured dress.If anyone ever asks her how old she is,she always answers,'Darling,it must be terrible to be grown up!
must 表示主观上应该做,have to 表示手客观条件限制,不得不去做
如果忽略语境上的要求,时刻以替换的,而且您说的will have to has to 两种都可以
根据文章应该用will have to
再问: 原文来了