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题目
By next Sunday she ( )with us for three weeks.A.will have stayed B.will has stayed
选哪一个?另一个为什么不选?

提问时间:2020-07-26

答案
将来完成时
  1.概念:在将来某一时刻之前开始的动作或状态
  2.时间状语:by the time of;by the end of+时间短语(将来);by the time+从句(将来)
  3.基本结构:be going to/will/shall + have done
  4例句:By the time you get back,great changes will have taken place in this area
先A
has 跟在be going to will shall 后面变动原形即have
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