The boy keeps coughing, and the doctor tells the parents it still needs more time to ________ the reason．A.put offB.figure outC.make upD.look through
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B解析考查动词短语辨析。put off推迟，拖延；figure sth.out弄懂，弄清楚；make up编造；化妆；look through翻阅，翻找。分句句意为：要查明原因还需要更多时间。故选B项。