By the time he retires, Carl______presid

最全题库2022-08-02  31

问题 By the time he retires, Carl______president for 15 years at the university.A.would beB.will have beenC.will beD.has been

选项 A.would be
B.will have been
C.will be
D.has been

答案 B

解析 句意:等到卡尔退休的时候,他已经在这所大学"-3了l5年校长了。by the time引导状语从句时,从句如果用一般现在时表示将来的动作,主句用将来完成时,故选B。
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