She looks happy.she(must)have passed the exam. I guess so.It is not difficult.为什么用must不用might,后面不是有I guess so.了吗

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Shelookshappy.she(must)havepassedtheexam.Iguessso.Itisnotdifficult.为什么用must不用might,后面不是有Iguessso.了吗S

She looks happy.she(must)have passed the exam. I guess so.It is not difficult.为什么用must不用might,后面不是有I guess so.了吗
She looks happy.she(must)have passed the exam. I guess so.It is not difficult.
为什么用must不用might,后面不是有I guess so.了吗

She looks happy.she(must)have passed the exam. I guess so.It is not difficult.为什么用must不用might,后面不是有I guess so.了吗
must 表推测,翻译成一定,表示推测概率很大,后面不是说了考试很简单么,她又很高兴,说明一定通过了考试;might表推测时表示可能性很小

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请楼主细细分清,must 和 might 是分别 出自两人之口的。

Must have done对过去发生的事情的肯定的推测

因为后面说了考试不难,如果前面是表示不确定的might的话,后面的意思应该是类似“我也说不准,其实考试也不太容易”这样的语气。