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He ___(be)an orphan,the nurse looked after him carefully.用适当形式填空

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He ___(be)an orphan,the nurse looked after him carefully.
用适当形式填空
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答案和解析
being
本句主语是护士,前半句是独立主格结构,有另一个主语He出现,但动词须用非谓语形式,所以was改为being