---I’m going to Vietnam?
---How long ___ you___ in Vietnam?
A．a(chǎn)re; stayed　　B．a(chǎn)re; staying
C．have; stayed　D．did; stay
B
試題分析：句意：——我要去越南？你要在越南呆多久？根據(jù)語境，表將來完成，How long多久，表示時間段，經(jīng)常和完成時態(tài)連用，此處用現(xiàn)在完成時表示將來完成。故選C。
點評：現(xiàn)在完成時表將來的情況多發(fā)生在時間或者條件狀語從句中,現(xiàn)在完成時可以代替將來完成時,如：I won't believe you until I have seen you in the jar with my own eyes.
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