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    精英家教网 > 高中英语 > 题目详情
    At last he       finish the work ahead of time.
    A．couldB．was able to
    C．could have doneD．would have been able to
    B
    此句检测对can和be able to辨析使用的能力。从时态上讲，can只有过去，而be able to可用于各种时态；从语意上讲，be able to的过去可表示“设法完成某事”，相当于managed to do sth.而could则无此?用法。?
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