On her next birthday, Ann ________ married for twenty years.

A. is  
B. has been
C. will be  
D. will have been
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科目：高中英語 來源：同步題 題型：單選題

On her next birthday, Ann ________ married for twenty years.
[     ]
A. is  
B. has been
C. will be  
D. will have been

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