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At last he ___finishi the work ahead of time.

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At last he ___finishi the work ahead of time.
A.couldB.was able to C.could have done D.would have been able to
请问一下B.D的区别、would have been 的意思是什么、?be able to do 与can do 的区别是什么?wouldn't/won't的用法是什么、?
本题答案肯定是D了,是假设的虚拟语气,他最终,还是能够提前完成哪项工作的.有一种假设条件在里面