问题
选择题
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
答案：C
考查倒装句。Only+状语/状语从句位于句首，主谓应部分倒装。可排除A、D，居民被允许回到家园不可能发生在火势被控制之前，故不能用过却完成时。
