问题描述：
填什么 By next Sunday she ____ (stay)with us for three weeks
答案上是will have stayed
令我不解的是第三人称的不是用has吗,那应该是will has stayed才是呀,到底什么原因呢
答案上是will have stayed
令我不解的是第三人称的不是用has吗,那应该是will has stayed才是呀,到底什么原因呢
问题解答：
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