29．The moment we heard of the accident, we the work to rescue those trapped in the mine． ——青夏教育精英家教网——

29．The moment we heard of the accident, we _______ the work to rescue those trapped in the mine．

　　　 A．set off　　　　　　　 B．set down　　　　　 C．set back　　　　　 D．set about

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