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    精英家教网 > 高中英语 > 题目详情

    _______ his return from America, he got down to his research.

    A．While B．In C．As D．On 

    D

    解析试题分析：考查固定句型结构。on+n/v-ing表示”一....就”。句意：他一从美国回来，就着手他的研究。故选D。As作介词时意思是“作为”，while不能做介词。
    考点：考查固定句型结构。

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