By the time he retires, Carl______presid

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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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