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：
試題
分析：句意：到貝克講授退休時，他將從事教育40年了。這里教授還未退休，退休發(fā)生在將來，又因為By the time故用將來時的完成時，故選A�？键c：考查將來完成時的用法。
點評：本題難度適中。將來完成時是高中階段動詞的時態(tài)類比較難以理解的一種時態(tài)�？忌c一般將來時混淆，一般將來時指從現(xiàn)在來看將要發(fā)生的動作；
而將來完成時指在將來某個時間之前已經(jīng)完成的動作。即學即練：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：如果你十分鐘前加入聊天室，你就會知道（那時）我們在談什么。
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