—Hi, Jack! When did you arrive in Berlin?
—Last weekend .I a different culture since then.
A. was experiencing
B. will be experiencing
C. have been experiencing
D. had been experiencing
网友回答
A. was experiencing
B. will be experiencing
(答案→)C. have been experiencing
D. had been experiencing
解析：考查时态：句意：--嗨，杰克，你什么时候到柏林的？--上个星期，自从那时我一直体验一种不同的文化。时间状语是since then，和现在完成时或现在完成进行时连用，选C。