单选题 People in the hospital burst into cheers after doctors completed a 20-hour operation to ＿＿＿＿＿＿＿＿＿＿ one-year-old twins at the heads. 的答案

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题目内容：
People in the hospital burst into cheers after doctors completed a 20-hour operation to ＿＿＿＿＿＿＿＿＿＿ one-year-old twins at the heads.
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