It ________ them about half an hour ________ the problem．

[　　]

A．used, to discuss

B．used, discussed

C．took, discussing

D．took, to discuss

答案：D
解析：

本題考察的是“It takes sb．some time to do sth．”意思是“某人花費(fèi)多少時(shí)間做某事”。


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