they had finished 和they finished有什么区别?最好有专业的英语老师50. At the end of last month, they _____ thirty percent of the production plan. A、will finish B、have finished C、had finished D、finished选

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they had finished 和they finished有什么区别?最好有专业的英语老师50. At the end of last month, they _____ thirty percent of the production plan. A、will finish B、have finished C、had finished D、finished选
they had finished 和they finished有什么区别?
最好有专业的英语老师
50. At the end of last month, they _____ thirty percent of the production plan.
A、will finish
B、have finished
C、had finished
D、finished
选哪个?为什么?

they had finished 和they finished有什么区别?最好有专业的英语老师50. At the end of last month, they _____ thirty percent of the production plan. A、will finish B、have finished C、had finished D、finished选
答案：D
翻译：在上个月末,他们完成了30%的生产计划.
解析：
1 由于时间是在上个月末,是过去时间,所以排除AB.
2 一般过去时态是指“在过去某个时间发生的动作或存在的状态,通常与表示过去的时间状语,如yesterday,last night等连用”.这里的 At the end of last month是过去时间,所以只要用一般过去时态.
3 过去完成时(past perfect)表示：在过去某一时间或动作之前已经发生或完成了的动作或状态,它表示句子中描述的动作发生在“过去的过去”.比如：We had learned over two thousand English words by the end of last term.
4 如题目的at the end of 改成了 by the end of,正确答案就选C.

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