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 free

C. are set free D. would be set free

 

C

【解析】

試題分析:考查時間狀語從句。主句用的是一般現(xiàn)在時,從句也用相應(yīng)的現(xiàn)在時態(tài)他,排除D;before在......之前,沒來得及;引導時間狀語從句時,從句用一般現(xiàn)在時代替一般將來時,A項是虛擬語氣的結(jié)構(gòu),故選C。

考點:考查時間狀語從句

 

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