By the time he retires, professor Baker _____ for almost forty years．A．will have
题型：不详难度：来源：
By the time he retires, professor Baker _____ for almost forty years．| A．will have taught | B．had taught | | C．has taught | D．is teaching |
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答案
| ：A |
解析
| ：考查时态。By与完成时连用，by后面的时间状语从句用一般现在时代替将来时，所以主句中用将来完成时。句意：等到他退休的时候，Baker教授将已经教了40年的书了。故A正确。 |
举一反三
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