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(cè)對(duì)can和be able to辨析使用的能力。從時(shí)態(tài)上講，can只有過(guò)去，而be able to可用于各種時(shí)態(tài)；從語(yǔ)意上講，be able to的過(guò)去可表示“設(shè)法完成某事”，相當(dāng)于managed to do sth.而could則無(wú)此?用法。?
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