Had we assisted him , he ________ us a hand ________ today .
A．would have given ; in exchangeB．should give ; to exchange
C．could give ; in exchangeD．might have given ; to exchange for
C
考查虛擬語氣，had we assisted him="If" we had assisted him是虛擬條件句，主句是和現(xiàn)在相反，用could do，第二空in exchange，做為交換，句意是：如果我們幫助他，今天他就會幫我們做為交換了。選C。
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