题目 / 答案提交正确答案
By the end of last year, we _____ the work.[ ]
A. has finished
B. had finished
C. have finished
D. finish
答案
B
过去完成时的定义
过去完成时：
是把时间推移到过去某一时间之前，与现在不发生联系，由＂had+-ed分词＂构成。
过去完成时的知识扩展
过去完成时既可表示过去某个时间或动作之前所发生的事情，也可表示过去某个时间或动作之
前所发生的动作一直持续到过去某个时间。
过去完成时由“had+过去分词”构成。
1. 过去完成时表示过去某个时间或动作之前所发生的事情
例如：He had learnt some English before I went here.
2. 过去完成时还经常用于主句为过去时的宾语从句中
例如：He said he had been a soldier.
3. 在hardly/scarcely…when…, no sooner…than…两个结构中的主句通常用过去完成时
例如：Hardly had I told her the news when she began to cry out.
4. 动词expect, hope, want等的过去完成时可用来表示未实现的计划、打算或希望。
例如：I had hoped to see you.
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