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  3. ________he retires, Prof. Baker will have taught in this university for nearly forty years.

________he retires, Prof. Baker will have taught in this university for nearly forty years.

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问题 ________he retires, Prof. Baker will have taught in this university for nearly 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 by the time：到……的时候(为止)，可用作连词，常用来引导时间状语从句，符合题意。by this time：到这时；at the time：当时；at the same time：同时，这三项在句中作时间状语，不能引导状语从句，不符合题意。故选D。
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