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Allen has decided that he will be an engineer by the time he ________ twenty.

Ahad beenBis going to be

Cwill beDis

 

D

【解析】答案:D 考查考生对题干和动词时态的理解及掌握情况。句中by the time相当于when,用来引出时间状语从句,从句中需用一般现在时表将来,故选D

 

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