The building _____(建成)before i left.

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The building _____(建成)before i left.
需要用完成时还是过去式还是各有意思
i turned off the lights before i left为什么用过去式 i had turned off the lights before i left为什么用完成时第一个表示过去完成的第二个表示对现在有影响那The building _____(建成)before i left。为什么不用过去式

用过去完成时的被动语态,因为动作在LEFT之前完成,即 had been built
再问：此句改成过去式怎么改
再答： The building was built before I left.
再问：你是说两句The building was built before I left The building had been built before i left都对各有意思吗
再答：如果一定要用过去时,就对,但根据句意用第二句,,即过去完成时更好

i remembered ______ the door before i left the house the,left,badly,I,floor,shake,I,building,immediately,felt and building,the,on,white.is,left,the. 1._____ left before the deadline for the task,Tom doesn't lo you should have thanked her before you left.I mean _____,but I ___ the book I wanted to find before I left the bookstore The village is building a school.I hope it__(finish)before A 英语单项选择求教!I remembered （）the door before I left the office, I remembered( )the door before I left the office,but forgot I remembered（） the door before I left the housebut forget to Before I left the room,I ——（turn）the light.要用过去完成时吗 I remembered ( ) the door before I left the office,but forge