The boy keeps coughing,and the doctor tells the parents it still needs more time to the

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A. put off
(答案→)B. figure out
C. make up
D. look through
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。