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thetime的用法!比如bythetime加将来时,后面用的时态.最好有例句.

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the time的用法!比如by the time加将来时,后面用的时态.最好有例句.
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答案和解析
by the time 如果是后面加将来时的话,后面主句一般都是将来完成时
by the time they get there,we'll have finished this work.