How long teaching? Forty years.A. he will have beenB. will have he beenC. will have been

问题补充：

How long teaching? Forty years.

A. he will have been

B. will have he been

C. will have been he

D. will he have been

答案：

A. he will have been

B. will have he been

C. will have been he

(答案→)D. will he have been

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