By the time he retires, professor Baker _____ for almost forty years．
A．will have taughtB．had taught
C．has taughtD．is teaching
：A
：考查時(shí)態(tài)。By與完成時(shí)連用，by后面的時(shí)間狀語從句用一般現(xiàn)在時(shí)代替將來時(shí)，所以主句中用將來完成時(shí)。句意：等到他退休的時(shí)候，Baker教授將已經(jīng)教了40年的書了。故A正確。
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