The doctors did everything they-----save the---old woman but failed.A could;dead B could to;dead C could;dying D could to;dying前者为什么选could to?could后为什么加to?to 在这里的用法?
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![The doctors did everything they-----save the---old woman but failed.A could;dead B could to;dead C could;dying D could to;dying前者为什么选could to?could后为什么加to?to 在这里的用法?](/uploads/image/z/9315898-34-8.jpg?t=The+doctors+did+everything+they-----save+the---old+woman+but+failed.A+could%3Bdead+B+could+to%3Bdead+C+could%3Bdying+D+could+to%3Bdying%E5%89%8D%E8%80%85%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89could+to%3Fcould%E5%90%8E%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8A%A0to%3Fto+%E5%9C%A8%E8%BF%99%E9%87%8C%E7%9A%84%E7%94%A8%E6%B3%95%3F)
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