题目内容

17.I don't know if he_______________.
If he_________,I will tell you.(  )
A.will come,comeB.comes,will comeC.will come,cameD.will come,comes

分析 ---我不知道她是否会来?
---如果他来了,我就会告诉你.

解答 答案:D.第一个if引导的宾语从句,主句是一般现在时,从句时态不受限制,结合句意表达的是将来的动作,故用一般将来时,第二个if引导的条件状语从句,遵循主将从现的规则,从句主语he,故comes,故答案是D.

点评 一条件状语从句,译为"如果".He will come if you invite him.如果你请他,他会来的.
二是宾语从句,译为"是否".I wonder if she is ill.不知她是否病了.

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