英语填空题By next June he ___(write)his second book要说明理由 为什么不是将来完

By next June he will have written his second book.---将来完成时用来表示在将来某一时间以前已经完成或一直持续的动作.经常与before+将来时间或by+将来时间连用,也可与before或by the time引导的现在时的从句连用.

若用将来时的话，句子就应该改为
he ___(write)his second book next June。
这样的话就不需要用介词by来修饰了,况且在时间词之前时多表示在。。同时，不迟于。。，在。。。期间的意思

by next june he will write his second book
要用完成时，应是以下这种状态
by the next june he will have writen his second book
将来完成时需要在next 前加the