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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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