题目内容

---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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