题目：
Had we assisted him , he ________ us a hand ________ today .
A．would have given ; in exchange
B．should give ; to exchange
C．could give ; in exchange
D．might have given ; to exchange for
答案：
答案：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。
