By the end of last year,he （）（act）in hundreds of films and TV series 动词填空.
问题描述：
By the end of last year,he （）（act）in hundreds of films and TV series 动词填空.
答
had acted..一般时间状语有by的一般都是用完成时，而这里是By the end of last year，用过去完成时
答
had acted 过去完成时态，由by+过去时间状语引出的短语，句子的时态用过去完成时。
很高兴为你解答！
老师祝你学习进步！
望采纳，多谢你的问题！^_^
答
By the end of last year 到去年年底为止
句子用完成时态，去年，所以用过去完成时态 had acted
希望能采纳，谢谢
答
had acted
答
had acted
不明白的再问哟,请及时采纳,多谢!
答
HAD ACTED 前面有一个时间点，过去的过去，用过去完成时
答
填had acted。