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．a(chǎn)re set freeD．would be set free
C               
             
試題分析：考查動詞的時態(tài)與語態(tài)。句意：科學(xué)家們也不知道需要過多久籠子里的野生動物才能被放出來。It will be +some time +before+…+does/do 例句: It will be one and a half years before I leave school.還有一年半時間我就要畢業(yè)了。t was +some time +before 過了多久才 例句：It wasn’t long before he told me that. 沒過多久他就把那件事告訴我了。再根據(jù)set free 與 wild animals之間是被動關(guān)系，所以選C項。
考點 : 考查動詞的時態(tài)與語態(tài)
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