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18.It was announced that only when the terrible disease was

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18.It was announced that only when the terrible disease was under control _______ to return to their homes.A.the residents would decide B.would the residents decideC.would the residents be decided D.the residents would be decided答案选B,为什么不能选A?
that从句是that only when the terrible disease was under control _______ to return to their homes
这里是only+when状语从句位于句首,所以,主句谓语得部分倒装.
又如:
Only in this way can we learn English well.
Only when he tells you about that can you understand why he won't come.