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I don’t know if he ____in the exam,but h...

I don’t know if he ____in the exam,but he’ll do better if he____harder.

A. Succeed;work

B. Succeed;will work  

C. will success; works

D. will succeed;works

 

D 【解析】 试题分析:句意:我不知道他是否成功通过考试,但是如果他努力他将一定做的很好。根据if引导宾语从句时,句中的时态由主句决定;而if引导条件状语从句时,谓语动词需要遵循“主将从现原则”,推知此处应该使用一般现在时态,主语为he,谓语动词使用单数第三人称;根据句意及结构,故选D。 考点:考查if引导不同从句的用法。  
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