It was announced that only when the fire was under control permitted to return to their homes.
A. would villagers be
B. villagers would be
C. should villagers be
D. villagers should be
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(答案→)A. would villagers be
B. villagers would be
C. should villagers be
D. villagers should be
解析：考查only引导的部分倒装。Only的倒装有两个条件：only要放在句首，且后面强调的是状语。本题only放在了句首，后面强调的是时间状语从句when the fire was under control，故后面的主语使用部分倒装的形式。Would意为“会”；should表示应该；句意：据宣布，只有当火灾被控制住以后村民们才被允许回到他们的家。故A正确。