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---I’m going to Vietnam?
---How long ___ you___ in Vietnam?
A.are; stayed  B.are; staying
C.have; stayed D.did; stay
B
试题分析:句意:——我要去越南?你要在越南呆多久?根据语境,表将来完成,How long多久,表示时间段,经常和完成时态连用,此处用现在完成时表示将来完成。故选C。
点评:现在完成时表将来的情况多发生在时间或者条件状语从句中,现在完成时可以代替将来完成时,如:I won't believe you until I have seen you in the jar with my own eyes.
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