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    精英家教网 > 高中英语 > 题目详情
    Scientists also have no idea how long it will be before all wild animals in the cages _____.
    A．should be set free B．will be set freeC．are set freeD．would be set free
    C               
                 
    试题分析：考查动词的时态与语态。句意：科学家们也不知道需要过多久笼子里的野生动物才能被放出来。It will be +some time +before+…+does/do 例句: It will be one and a half years before I leave school.还有一年半时间我就要毕业了。t was +some time +before 过了多久才 例句：It wasn’t long before he told me that. 没过多久他就把那件事告诉我了。再根据set free 与 wild animals之间是被动关系，所以选C项。
    考点 : 考查动词的时态与语态
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