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 |
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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 |
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