It was announced that only when the fire was under control to return to their homesA.the residents would be permittedB.had the residents been permittedC.would the residents be permittedD.the residents had been permitted
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C解析试题分析：考查倒装句和时态：句意：据宣称只有当火势得到控制的时候，居民们才可以返回家中。Only+when从句放在句首时，用部分倒装。因为是火势得到控制才能回家，时态应用过去将来时。选C。考点：考查倒装句和时态