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

At last he ___finishi the work ahead of time. He was _______ at the thought of all the hard work ahead. _____your help.We completed the work ahead of time. _______has finish the work ahead of time will be Do you b_____to finish the work ahead of time The job is believed---ahead of time last week. The boss ( )（命令）us to finishi the work ahead of time. I felt depressed at the thought of all the hard work ahead. I finished my work ahead of time,__________ I read the local ______ has finished the work ahead of time will be rewarded 一道英语选择（）has finished the work ahead of time will be rewarded 倒装句,在线等. ______ likely to finish the work ahead of time.A. O