Had we assisted him , he ______ us a hand ______ today.A.would have given ; in exchangeB.should give ; to exchangeC.could give ; in exchangeD.might have given ; to exchange for
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C解析考查虚拟语气，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。