问题补充：
---I am going to Japan.
--- How long you there ?
A. are; stayed
B. are; staying
C. have; stayed
D. did; stay
答案：
A. are; stayed
(答案→)B. are; staying
C. have; stayed
D. did; stay
解析：考查进行时态表将来。句意：我打算去日本。你在那呆多长时间？选B，stay用进行时态表示将来。
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