问题
选择题
The boy keeps coughing,and the doctor tells the parents it still needs more time to _____
the reason.
A．put off
B．figure out
C．make up
D．look through
答案
B
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。