求详细过程并分析句子成分?It was announced that only when the fire was under control________to ...

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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

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