i think by five o'clock the children ()from their work.A.wil

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i think by five o'clock the children ()from their work.A.will return B.had turn C.will have return

I think by five o'clock the children (C.will have return) from their work.
我认为到五点钟之前,孩子们都已经下班回家了.
时间状语by five,意为“截止到五点时（已经做了）”,它用于完成时态.而宾语从句的动作是还没有发生的,所以这句话是将来完成时,由助动词will have加过去分词构成.
再问：哦，那像这种呢：i（）there five minutes when all the lights ().A.had been/went. B.have been/go
再答：选择A。从句过去时，主句是过去完成时。

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