求详细过程并分析句子成分?It was announced that only when the fire was under control________to ...求详细过程并分析句子成分?It was announced that only when the fire was under control________to return to their homes.A．the residents would be permitted B．had the residents been permitted C．would the residentsbe permitted D．the residents had been permitted
问题描述：
求详细过程并分析句子成分?It was announced that only when the fire was under control________to ...
求详细过程并分析句子成分?It was announced that only when the fire was under control________to return to their homes.A．the residents would be permitted B．had the residents been permitted C．would the residentsbe permitted D．the residents had been permitted
答
你好.答案是C
It was announced that- - - - - -- - 这是主语从句.it 是形式主语,真正主语是only - - -- to their homes. that是主语从句的引导词.由only when - -- - 构成的时间状语从句放在句首,主句倒装