问题补充：
My father Beijing on business for three days. He will be back in two days.
A. have gone to
B. has gone to
C. has been to
D. has been in
答案：
A. have gone to
B. has gone to
C. has been to
(答案→)D. has been in
解析：根据时间状语for three days，可知要用延续性动词，故选答案为D，只有D符合题目，故选答案为D
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