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
【正确答案】
C
【答案解析】
that从句中only引导的时间状语从句位于句首，that从句需用部分倒装结构。根据句意可知控制火势在先，允许回家在后，所以应用过去将来时。故答案为C。
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