问题
选择题
He _____ English for ten years by the time he takes the examination.
A．will have been studying
B．would have been studying
C．will study
D．studied
答案
答案：A
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He _____ English for ten years by the time he takes the examination.
A．will have been studying
B．would have been studying
C．will study
D．studied
答案：A