At last he       finish the work ahead of time.
A．couldB．was able to
C．could have doneD．would have been able to
B
此句檢測對can和be able to辨析使用的能力。從時態(tài)上講，can只有過去，而be able to可用于各種時態(tài)；從語意上講，be able to的過去可表示“設(shè)法完成某事”，相當(dāng)于managed to do sth.而could則無此?用法。?
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