2. 专升本
  3. By the time he retires, Professor Baker______for almost forty years.

By the time he retires, Professor Baker______for almost forty years.

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问题 By the time he retires, Professor Baker______for almost forty years.
选项 A、will teach
B、will have taught
C、has taught
D、will be teaching
答案B
解析 句意：贝克教授到退休时，将教学近四十载。本题考查将来完成时。词组by the time意为“在……之前”，引导的从句用现在时表示将来时，故主句需用将来时。而且teach这个动作一直持续到retire这个动作发生，故需用完成时。结合两者，就该用将来完成时，选B。
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