Had we assisted him , he ________ us a hand ________ today .
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C

考查虚拟语气,had we assisted him="If" we had assisted him是虚拟条件句,主句是和现在相反,用could do,第二空in exchange,做为交换,句意是:如果我们帮助他,今天他就会帮我们做为交换了。选C。

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