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I don’t know if he ______ me if he _____...

I don’t know if he ______ me if he ______ free.

A. will help, will be    B. helps, is    C. will help, is    D. helps, will be

 

C 【解析】句意:我不知道如果他有空,他是否帮助我。第二空if表示“如果”,引导的条件状语从句,用一般现在时表示一般将来时,因此谓语用is。第一个if表示是否,引导的宾语从句,根据if引导的条件状语从句用一般现在时,主句用一般将来时,故第一空用will help。故选C。  
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