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请问it be…before…的句型用法…比如说it was 3 years before he …

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请问it be…before…的句型用法…比如说it was 3 years before he …
请问it be…before…的句型用法…比如说it was 3 years before he …
It was/will be+时间段+before...过了…才…
eg:It was three years before he finished the work.他花了三年才完成这项工作.
It will be three years before he finishes the work.他得花三年才能完成这项工作.