she must have arrived there yesterday .这是什么时态

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• she must have been a temporary worker 是什么时态?
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• Jenny is only three years old.she is too young______alone at home.A.to leave 动词不定式一般式主动形式B.to be leaving 动词不定式进行时主动形式C.to be left 动词不定式一般是被动形式D.to have been left 动词不定式完成时被动形式答案是C,但我的疑问是D为什么不行?她被留在家里,因此可以排除AB,那么CD都是被动形式,只是时态不同,在这道题中该怎么判断呢?是因为she后面的be动词已经是is了,所以就代表这是一般式吗?
• 1.What's the matter with her?She says that she have got headache.请问回答中的have是否要改成第三人称单数形式has?可是has是have的第三人称一般现在形式,got又是get的过去分词和过去式,has和got放在一起是不是矛盾.如果可以,这句话就是主语+has+过去分词+其他 那这句话算不算完成时态?现在完成时态为什么会有has这个第三人称现在式?这是不是很矛盾?
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• now that she is out of a job,mary__going back to school,but she hasn"t decided yethas been considering 露茜还没决定就是正在考虑中选项中就是填这个,我想问的是 这到底是什么时态.如果是现在完成进行时不是用的是having been considered,这是我想的 ,我的假说成立吗have(has)been v+ing 现在完成进行时中 这个been是个什么成分
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