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问题: 英语

By the time he arrives in Tianjin ,we () here
for two days
A have been staying
B will have stayed

解答:

选B.
通过By the time he arrives in Tianjin,时间状语从句中用了单三人称。知道实际是将来时间(在时间和条件状语从句中用一般现在时表将来)。一切还未发生。所以选B.