不定式和逻辑主语

The subject is hard to understand.

She was sent there to be trained as an astronaut.

“当不定式和逻辑主语有被动关系时,不定时就需用被动形式”,怎么判断哪个是逻辑主语?第二句话如果加上for us那到底是us还是she是逻辑主语啊?

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