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By the time he retires, professor Baker _____ for almost forty years.


  1. A.
    will have taught
  2. B.
    had taught
  3. C.
    has taught
  4. D.
    is teaching
A
解析:
试题
分析:句意:到贝克讲授退休时,他将从事教育40年了。这里教授还未退休,退休发生在将来,又因为By the time故用将来时的完成时,故选A。考点:考查将来完成时的用法。
点评:本题难度适中。将来完成时是高中阶段动词的时态类比较难以理解的一种时态。考生往往与一般将来时混淆,一般将来时指从现在来看将要发生的动作;
而将来完成时指在将来某个时间之前已经完成的动作。即学即练:Had you joined the chat room ten minutes ago, you would have known what we ___about then.A. had talked        B. have talked       C. talk                 D. were talking解析:D。句意:如果你十分钟前加入聊天室,你就会知道(那时)我们在谈什么。
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