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将来完成进行时
近两年，试卷中也会出现将来完成时的考题。将来完成进行时表示一个已经开始的动作到将来某一时间仍在进行，其基本结构是will/shall + have been doing.
例：By the end of next month I shall have been working here for 20 years.
下个月底我在这里工作就满20年了。
往年试题：
例：By the time you arrive this evening, ______for two hours.
A. I will study B. I will have been studied C. I had studied D. I will have been studying
答案：D
