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  3. ______he retires, Prof. Baker will have taught in the university for almost forty years.

______he retires, Prof. Baker will have taught in the university for almost forty years.

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问题 ______he retires, Prof. Baker will have taught in the university for almost forty years.
选项 A、By this time
B、At the time
C、At the same time
D、By the time
答案D
解析 句意：贝克教授到退休时，就已经在大学任教近40年了。词义辨析题。by the time：到……为止；at the time：在那时；by this time：到现在；at the same time：与此同时。由题干可知，本句时态为将来完成时，故选D。
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