By the time i——back they——up ten metres.

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/04/29 05:46:22

By the time i——back they——up ten metres.
A came.have climbed B came.had climbed
C come.have climbed D had come.climbed

B
by+过去时间,主句用过去完成时态.
再问：为什么这句中后面一句是主句？怎么分辨的？
再答： by是介词，后面所跟明显是从句。主句位置可以在句后。
再问：介词后面是从句吗？谢谢~
再答： by the time 短语后所跟I came back ，整个做时间状语从句。另外，借词后常可跟从句。

By the time i——back they——up ten metres. by the time I came back they had climbed up.. Had they g_____ up by the time I came back home? i suppose by the time i come back in ten years time all thes They——to enter the building by the back door； howerve,the fr —I was caught in the heavy rain, so I couldn’t be back by 7 I -----my work by the time the teacher ----- back. By this time of next Friday,I——to New York by the Korean Air your homework ( ) by the time i come back by the time he showed up ,we （）ten trees A have planted B ha by the time i was ten,i had could speak English well 这句话表达正确 —____ will he be back?—In ten days.