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【题目】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 residents be permitted
D.the residents had been permitted

【答案】C
【解析】句意:通报说,只有火势得到控制了居民们才被允许回家。这里It是形式主语,真正的主语是that引导的从句;that引导的主语从句中,"only+状语从句"位于句首,状语从句对应的主句要用倒装语序,且此处表示过去将来,故选C。

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