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who hElpED BEtty

B

B 由题干She cleaned it all by herself.可知是她自己打扫的房间,因此用B。tidy up the bedroom是打扫干净卧室的意思。help sb. do sth.帮助某人做某事。

选to help 在主动语态中,为see sb. do/doing,但是see在被动语态中,要还原不定式的to,这是固定用法。

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