by the time he leaves university,he ( )much work experience so long as he takes a part time jobby the time he leaves university,he ( will have gained )much work experience so long as he takes a part time job.为何不用has gained

What time does he usually leave home by bike? By the time he arrived at the stop, the 8 o'clock bus_____________(leave). So he had to wait for the next bus. We can't leave leave the child by ______(he) by the time i got to the bus stop,the bus_ already_（leave） By the time I got to the bus stop,the bus___a ready ____ (leave) the train ____(leave) by the time we arrived at the station By the time the war broke out,most of people____(leave) 动词填空：She ( ) by the time he got back.(go ) By the time that we got there,he was out. 翻译By the time he comes,I'll have left.( By the time he came,I had left.) by the time he returns,the project probably ____ahead of time by the time ,by then She had gone by the time he got back 其中的by the time 能用when 或while替换吗 by the time l got there,the plane ...(leave) already.用所给动词的适当形式填空 By the time by the time by the time you came back,we (complete)the work by the time he comes back,we (complete)the workby the time you came back，we (complete)the workby the time he comes back,(complete)the work By the time Jane gets home ,her aunt ()for London to attend a meeting.A、will leave B、leaves C、