单选题 The doctors successfully completed a 20-hour operation to _______ the one-year-old twins at the head.
【正确答案】 B
【答案解析】[解析] 本题考查动词词义辨析。isolate意为“使隔离、孤立”；separate意为“使分开，离开”；divide意为“分开(将整体分成部分)”；remove意为“去除”。根据句意，故选B。