问题补充：
The employees feel so excited ! At this time tomorrow morning they to Sanya, one of the most attractive cities in China.
A. will be flying
B. will fly
C. have been flying
D. have flown
答案：
(答案→)A. will be flying
B. will fly
C. have been flying
D. have flown
解析：根据句意明天早上的这个时候，他们正飞往三亚。故用将来进行时。选A。句意：员工们感到很兴奋！明天早上的这个时候，他们将正在飞往三亚，三亚是中国最美的城市之一。
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