,一道填空是这样的 he came back late,（by） which time all the guests h

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,一道填空是这样的 he came back late,（by） which time all the guests had already left
请问这是定语从句吗,如果是的话从句修饰的是那一部分?by which 代替的是主句里的哪一部分呢?还有which 前面为什么要接by呢

是定语从句,by “到.时为止”,which time 指代前面的他回来的时间,相当于 by the time when he came back,all the guests had already left.如果把 late 换成 at 10:00,可能好理解,但是 at 10:00 在句中也是作状语.

,一道填空是这样的 he came back late,（by） which time all the guests h John came back late,___________ which time all the guests ha He came back late,____which time all the guests had already He came back late,___which time all the guests had already l He came back late,________which time all the guests had alre He came back late,( )all the guests had already left. 用动词的正确时态填空1）Almost all the guests (leave) ______ by the time 英语问题：在特定的情景中,为什么by which time可以改成by the time when he came ba He came back home in April,by which time his grandfather ___ （）by the traffic ,he came late to the meeting 动词填空：She ( ) by the time he got back.(go ) by the time I came back they had climbed up..