过去分词和现在分词的完成被动式作状语时有什么区别 10. ________ many times, he finally understood it.

题目

过去分词和现在分词的完成被动式作状语时有什么区别 10. ________ many times, he finally understood it.

答案

先填空After thought for a many times.he finally understood it.只是时态的区别呀,举个例子The book have been read by me just now after several days' reading.The book had been read by me before when i was...